Attachment 348622 Details for Bug 189169 – patch

[patch] patch

optionset-add-remove-4.patch (text/plain), 104.48 KB, created by Antti Koivisto on 2018-08-31 02:06:28 PDT

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Creator: Antti Koivisto

Created: 2018-08-31 02:06:28 PDT

Size: 104.48 KB

patch

obsolete

>Index: Source/WTF/ChangeLog
>===================================================================
>--- Source/WTF/ChangeLog	(revision 235539)
>+++ Source/WTF/ChangeLog	(working copy)
>@@ -1,3 +1,23 @@
>+2018-08-31  Antti Koivisto  <antti@apple.com>
>+
>+        Replace OptionSet |= and -= operators with add() and remove() functions
>+        https://bugs.webkit.org/show_bug.cgi?id=189169
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Improve code readability.
>+
>+        * wtf/OptionSet.h:
>+        (WTF::OptionSet::add):
>+        (WTF::OptionSet::remove):
>+        (WTF::OptionSet::operator==):
>+        (WTF::OptionSet::operator!=):
>+        (WTF::OptionSet::operator|=): Deleted.
>+        (WTF::OptionSet::operator-=): Deleted.
>+        * wtf/ProcessPrivilege.cpp:
>+        (WTF::addProcessPrivilege):
>+        (WTF::removeProcessPrivilege):
>+
> 2018-08-30  Don Olmstead  <don.olmstead@sony.com>
> 
>         [CMake] Replace AVFoundationSupport.py using CMake
>Index: Source/WTF/wtf/OptionSet.h
>===================================================================
>--- Source/WTF/wtf/OptionSet.h	(revision 235539)
>+++ Source/WTF/wtf/OptionSet.h	(working copy)
>@@ -111,26 +111,24 @@ public:
>         return (*this & optionSet) == optionSet;
>     }
> 
>-    constexpr friend bool operator==(OptionSet lhs, OptionSet rhs)
>+    constexpr void add(OptionSet optionSet)
>     {
>-        return lhs.m_storage == rhs.m_storage;
>+        m_storage |= optionSet.m_storage;
>     }
> 
>-    constexpr friend bool operator!=(OptionSet lhs, OptionSet rhs)
>+    constexpr void remove(OptionSet optionSet)
>     {
>-        return lhs.m_storage != rhs.m_storage;
>+        m_storage &= ~optionSet.m_storage;
>     }
> 
>-    friend OptionSet& operator|=(OptionSet& lhs, OptionSet rhs)
>+    constexpr friend bool operator==(OptionSet lhs, OptionSet rhs)
>     {
>-        lhs.m_storage |= rhs.m_storage;
>-        return lhs;
>+        return lhs.m_storage == rhs.m_storage;
>     }
> 
>-    friend OptionSet& operator-=(OptionSet& lhs, OptionSet rhs)
>+    constexpr friend bool operator!=(OptionSet lhs, OptionSet rhs)
>     {
>-        lhs.m_storage &= ~rhs.m_storage;
>-        return lhs;
>+        return lhs.m_storage != rhs.m_storage;
>     }
> 
>     constexpr friend OptionSet operator|(OptionSet lhs, OptionSet rhs)
>Index: Source/WTF/wtf/ProcessPrivilege.cpp
>===================================================================
>--- Source/WTF/wtf/ProcessPrivilege.cpp	(revision 235539)
>+++ Source/WTF/wtf/ProcessPrivilege.cpp	(working copy)
>@@ -57,12 +57,12 @@ bool hasProcessPrivilege(ProcessPrivileg
> 
> void addProcessPrivilege(ProcessPrivilege privilege)
> {
>-    processPrivileges() |= privilege;
>+    processPrivileges().add(privilege);
> }
> 
> void removeProcessPrivilege(ProcessPrivilege privilege)
> {
>-    processPrivileges() = processPrivileges() - privilege;
>+    processPrivileges().remove(privilege);
> }
> 
> } // namespace WTF
>Index: Source/WebCore/ChangeLog
>===================================================================
>--- Source/WebCore/ChangeLog	(revision 235539)
>+++ Source/WebCore/ChangeLog	(working copy)
>@@ -1,3 +1,119 @@
>+2018-08-31  Antti Koivisto  <antti@apple.com>
>+
>+        Replace OptionSet |= and -= operators with add() and remove() functions
>+        https://bugs.webkit.org/show_bug.cgi?id=189169
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * accessibility/AccessibilityObject.cpp:
>+        (WebCore::AccessibilityObject::rangeOfStringClosestToRangeInDirection const):
>+        * css/StyleBuilderConverter.h:
>+        (WebCore::StyleBuilderConverter::convertTextDecoration):
>+        (WebCore::StyleBuilderConverter::convertTextEmphasisPosition):
>+        (WebCore::StyleBuilderConverter::convertTextUnderlinePosition):
>+        (WebCore::StyleBuilderConverter::convertTextDecorationSkip):
>+        (WebCore::StyleBuilderConverter::convertSpeakAs):
>+        (WebCore::StyleBuilderConverter::convertHangingPunctuation):
>+        * css/parser/CSSParser.cpp:
>+        (WebCore::CSSParser::parseSystemColor):
>+        * dom/Document.cpp:
>+        (WebCore::Document::styleColorOptions const):
>+        * dom/DocumentMarkerController.cpp:
>+        (WebCore::DocumentMarkerController::addMarker):
>+        (WebCore::DocumentMarkerController::removeMarkers):
>+        * dom/ScriptedAnimationController.cpp:
>+        (WebCore::ScriptedAnimationController::addThrottlingReason):
>+        (WebCore::ScriptedAnimationController::removeThrottlingReason):
>+        * dom/SecurityContext.h:
>+        (WebCore::SecurityContext::setFoundMixedContent):
>+        * dom/UIEventWithKeyState.cpp:
>+        (WebCore::UIEventWithKeyState::modifiersFromInitializer):
>+        (WebCore::UIEventWithKeyState::setModifierKeys):
>+        * dom/UserActionElementSet.cpp:
>+        (WebCore::UserActionElementSet::setFlags):
>+        * editing/CompositeEditCommand.cpp:
>+        (WebCore::CompositeEditCommand::moveParagraphs):
>+        * editing/Editor.cpp:
>+        (WebCore::Editor::replaceSelectionWithFragment):
>+        (WebCore::Editor::appliedEditing):
>+        (WebCore::Editor::markMisspellingsAfterTypingToWord):
>+        (WebCore::Editor::markMisspellingsAndBadGrammar):
>+        (WebCore::Editor::resolveTextCheckingTypeMask):
>+        * editing/FrameSelection.cpp:
>+        (WebCore::FrameSelection::moveWithoutValidationTo):
>+        (WebCore::FrameSelection::setSelectedRange):
>+        * editing/FrameSelection.h:
>+        (WebCore::FrameSelection::defaultSetSelectionOptions):
>+        * editing/MoveSelectionCommand.cpp:
>+        (WebCore::MoveSelectionCommand::doApply):
>+        * editing/SpellChecker.cpp:
>+        (WebCore::SpellChecker::didCheckSucceed):
>+        * editing/TextCheckingHelper.cpp:
>+        (WebCore::TextCheckingHelper::findFirstMisspellingOrBadGrammar):
>+        (WebCore::TextCheckingHelper::guessesForMisspelledOrUngrammaticalRange const):
>+        * editing/TextIterator.cpp:
>+        (WebCore::SearchBuffer::SearchBuffer):
>+        * html/HTMLAnchorElement.cpp:
>+        (WebCore::HTMLAnchorElement::parseAttribute):
>+        * inspector/agents/InspectorPageAgent.cpp:
>+        (WebCore::InspectorPageAgent::reload):
>+        * page/ContextMenuController.cpp:
>+        (WebCore::ContextMenuController::contextMenuItemSelected):
>+        * page/DOMWindow.cpp:
>+        (WebCore::DOMWindow::find const):
>+        * page/DragController.cpp:
>+        (WebCore::DragController::concludeEditDrag):
>+        * page/FrameSnapshotting.cpp:
>+        (WebCore::snapshotFrameRectWithClip):
>+        * page/FrameView.cpp:
>+        (WebCore::updateLayerPositionFlags):
>+        (WebCore::FrameView::willPaintContents):
>+        * page/Page.cpp:
>+        (WebCore::Page::setIsVisible):
>+        * page/PerformanceObserver.cpp:
>+        (WebCore::PerformanceObserver::observe):
>+        * page/TextIndicator.cpp:
>+        (WebCore::TextIndicator::createWithRange):
>+        * page/WindowFeatures.cpp:
>+        (WebCore::parseDisabledAdaptations):
>+        * page/csp/ContentSecurityPolicy.h:
>+        (WebCore::ContentSecurityPolicy::addHashAlgorithmsForInlineScripts):
>+        (WebCore::ContentSecurityPolicy::addHashAlgorithmsForInlineStylesheets):
>+        * page/csp/ContentSecurityPolicySourceList.cpp:
>+        (WebCore::ContentSecurityPolicySourceList::parseHashSource):
>+        * platform/PlatformEvent.h:
>+        (WebCore::PlatformEvent::PlatformEvent):
>+        * platform/ios/PlatformEventFactoryIOS.mm:
>+        (WebCore::modifiersForEvent):
>+        * platform/mac/PlatformEventFactoryMac.mm:
>+        (WebCore::modifiersForEvent):
>+        * rendering/RenderLayer.cpp:
>+        (WebCore::RenderLayer::updateLayerPositions):
>+        (WebCore::RenderLayer::updateLayerPositionsAfterScroll):
>+        (WebCore::RenderLayer::paintLayer):
>+        (WebCore::RenderLayer::paintLayerContentsAndReflection):
>+        (WebCore::RenderLayer::paintLayerContents):
>+        (WebCore::RenderLayer::paintForegroundForFragments):
>+        * rendering/RenderLayerBacking.cpp:
>+        (WebCore::RenderLayerBacking::paintIntoLayer):
>+        (WebCore::RenderLayerBacking::paintContents):
>+        * rendering/RenderLayerCompositor.cpp:
>+        (WebCore::RenderLayerCompositor::reasonsForCompositing const):
>+        (WebCore::RenderLayerCompositor::updateScrollCoordinatedStatus):
>+        * rendering/TextDecorationPainter.cpp:
>+        (WebCore::collectStylesForRenderer):
>+        * rendering/TextPaintStyle.cpp:
>+        (WebCore::computeTextPaintStyle):
>+        * rendering/style/RenderStyle.cpp:
>+        (WebCore::RenderStyle::changeRequiresLayout const):
>+        (WebCore::RenderStyle::changeRequiresLayerRepaint const):
>+        (WebCore::RenderStyle::changeRequiresRepaint const):
>+        * testing/Internals.cpp:
>+        (WebCore::parseFindOptions):
>+        (WebCore::Internals::forceReload):
>+        (WebCore::Internals::setPageVisibility):
>+        (WebCore::Internals::setPageIsFocusedAndActive):
>+
> 2018-08-31  Frederic Wang  <fwang@igalia.com>
> 
>         Bug 182053 - [CSSOM View] Implement standard behavior for scrollingElement
>Index: Source/WebCore/accessibility/AccessibilityObject.cpp
>===================================================================
>--- Source/WebCore/accessibility/AccessibilityObject.cpp	(revision 235539)
>+++ Source/WebCore/accessibility/AccessibilityObject.cpp	(working copy)
>@@ -751,9 +751,9 @@ RefPtr<Range> AccessibilityObject::range
>         return nullptr;
>     
>     bool isBackwardSearch = searchDirection == AccessibilitySearchDirection::Previous;
>-    FindOptions findOptions { { AtWordStarts, AtWordEnds, CaseInsensitive, StartInSelection } };
>+    FindOptions findOptions { AtWordStarts, AtWordEnds, CaseInsensitive, StartInSelection };
>     if (isBackwardSearch)
>-        findOptions |= Backwards;
>+        findOptions.add(Backwards);
>     
>     RefPtr<Range> closestStringRange = nullptr;
>     for (const auto& searchString : searchStrings) {
>Index: Source/WebCore/css/StyleBuilderConverter.h
>===================================================================
>--- Source/WebCore/css/StyleBuilderConverter.h	(revision 235539)
>+++ Source/WebCore/css/StyleBuilderConverter.h	(working copy)
>@@ -394,7 +394,7 @@ inline OptionSet<TextDecoration> StyleBu
>     auto result = RenderStyle::initialTextDecoration();
>     if (is<CSSValueList>(value)) {
>         for (auto& currentValue : downcast<CSSValueList>(value))
>-            result |= downcast<CSSPrimitiveValue>(currentValue.get());
>+            result.add(downcast<CSSPrimitiveValue>(currentValue.get()));
>     }
>     return result;
> }
>@@ -498,7 +498,7 @@ inline OptionSet<TextEmphasisPosition> S
> 
>     OptionSet<TextEmphasisPosition> position;
>     for (auto& currentValue : downcast<CSSValueList>(value))
>-        position |= valueToEmphasisPosition(downcast<CSSPrimitiveValue>(currentValue.get()));
>+        position.add(valueToEmphasisPosition(downcast<CSSPrimitiveValue>(currentValue.get())));
>     return position;
> }
> 
>@@ -645,7 +645,7 @@ inline OptionSet<TextUnderlinePosition> 
> 
>     OptionSet<TextUnderlinePosition> combinedPosition;
>     for (auto& currentValue : downcast<CSSValueList>(value))
>-        combinedPosition |= downcast<CSSPrimitiveValue>(currentValue.get());
>+        combinedPosition.add(downcast<CSSPrimitiveValue>(currentValue.get()));
>     return combinedPosition;
> }
> 
>@@ -753,7 +753,7 @@ inline OptionSet<TextDecorationSkip> Sty
> 
>     OptionSet<TextDecorationSkip> skip;
>     for (auto& currentValue : downcast<CSSValueList>(value))
>-        skip |= valueToDecorationSkip(downcast<CSSPrimitiveValue>(currentValue.get()));
>+        skip.add(valueToDecorationSkip(downcast<CSSPrimitiveValue>(currentValue.get())));
>     return skip;
> }
> 
>@@ -1504,7 +1504,7 @@ inline OptionSet<SpeakAs> StyleBuilderCo
>     auto result = RenderStyle::initialSpeakAs();
>     if (is<CSSValueList>(value)) {
>         for (auto& currentValue : downcast<CSSValueList>(value))
>-            result |= downcast<CSSPrimitiveValue>(currentValue.get());
>+            result.add(downcast<CSSPrimitiveValue>(currentValue.get()));
>     }
>     return result;
> }
>@@ -1514,7 +1514,7 @@ inline OptionSet<HangingPunctuation> Sty
>     auto result = RenderStyle::initialHangingPunctuation();
>     if (is<CSSValueList>(value)) {
>         for (auto& currentValue : downcast<CSSValueList>(value))
>-            result |= downcast<CSSPrimitiveValue>(currentValue.get());
>+            result.add(downcast<CSSPrimitiveValue>(currentValue.get()));
>     }
>     return result;
> }
>Index: Source/WebCore/css/parser/CSSParser.cpp
>===================================================================
>--- Source/WebCore/css/parser/CSSParser.cpp	(revision 235539)
>+++ Source/WebCore/css/parser/CSSParser.cpp	(working copy)
>@@ -119,7 +119,7 @@ Color CSSParser::parseSystemColor(const 
> 
>     OptionSet<StyleColor::Options> options;
>     if (context && context->useSystemAppearance)
>-        options |= StyleColor::Options::UseSystemAppearance;
>+        options.add(StyleColor::Options::UseSystemAppearance);
>     return RenderTheme::singleton().systemColor(id, options);
> }
> 
>Index: Source/WebCore/dom/Document.cpp
>===================================================================
>--- Source/WebCore/dom/Document.cpp	(revision 235539)
>+++ Source/WebCore/dom/Document.cpp	(working copy)
>@@ -7178,9 +7178,9 @@ OptionSet<StyleColor::Options> Document:
> {
>     OptionSet<StyleColor::Options> options;
>     if (useSystemAppearance())
>-        options |= StyleColor::Options::UseSystemAppearance;
>+        options.add(StyleColor::Options::UseSystemAppearance);
>     if (useDarkAppearance())
>-        options |= StyleColor::Options::UseDarkAppearance;
>+        options.add(StyleColor::Options::UseDarkAppearance);
>     return options;
> }
> 
>Index: Source/WebCore/dom/DocumentMarkerController.cpp
>===================================================================
>--- Source/WebCore/dom/DocumentMarkerController.cpp	(revision 235539)
>+++ Source/WebCore/dom/DocumentMarkerController.cpp	(working copy)
>@@ -331,7 +331,7 @@ void DocumentMarkerController::addMarker
>             downcast<RenderBlockFlow>(*renderer).ensureLineBoxes();
>     }
> 
>-    m_possiblyExistingMarkerTypes |= newMarker.type();
>+    m_possiblyExistingMarkerTypes.add(newMarker.type());
> 
>     std::unique_ptr<MarkerList>& list = m_markers.add(node, nullptr).iterator->value;
> 
>@@ -587,7 +587,7 @@ void DocumentMarkerController::removeMar
>             removeMarkersFromList(iterator, markerTypes);
>     }
> 
>-    m_possiblyExistingMarkerTypes -= markerTypes;
>+    m_possiblyExistingMarkerTypes.remove(markerTypes);
> }
> 
> void DocumentMarkerController::removeMarkersFromList(MarkerMap::iterator iterator, OptionSet<DocumentMarker::MarkerType> markerTypes)
>Index: Source/WebCore/dom/ScriptedAnimationController.cpp
>===================================================================
>--- Source/WebCore/dom/ScriptedAnimationController.cpp	(revision 235539)
>+++ Source/WebCore/dom/ScriptedAnimationController.cpp	(working copy)
>@@ -121,7 +121,7 @@ void ScriptedAnimationController::addThr
>     if (m_throttlingReasons.contains(reason))
>         return;
> 
>-    m_throttlingReasons |= reason;
>+    m_throttlingReasons.add(reason);
> 
>     RELEASE_LOG_IF_ALLOWED("addThrottlingReason(%s) -> %s", throttlingReasonToString(reason), throttlingReasonsToString(m_throttlingReasons).utf8().data());
> 
>@@ -140,7 +140,7 @@ void ScriptedAnimationController::remove
>     if (!m_throttlingReasons.contains(reason))
>         return;
> 
>-    m_throttlingReasons -= reason;
>+    m_throttlingReasons.remove(reason);
> 
>     RELEASE_LOG_IF_ALLOWED("removeThrottlingReason(%s) -> %s", throttlingReasonToString(reason), throttlingReasonsToString(m_throttlingReasons).utf8().data());
> 
>Index: Source/WebCore/dom/SecurityContext.h
>===================================================================
>--- Source/WebCore/dom/SecurityContext.h	(revision 235539)
>+++ Source/WebCore/dom/SecurityContext.h	(working copy)
>@@ -89,7 +89,7 @@ public:
>     };
> 
>     const OptionSet<MixedContentType>& foundMixedContent() const { return m_mixedContentTypes; }
>-    void setFoundMixedContent(MixedContentType type) { m_mixedContentTypes |= type; }
>+    void setFoundMixedContent(MixedContentType type) { m_mixedContentTypes.add(type); }
>     bool geolocationAccessed() const { return m_geolocationAccessed; }
>     void setGeolocationAccessed() { m_geolocationAccessed = true; }
>     bool secureCookiesAccessed() const { return m_secureCookiesAccessed; }
>Index: Source/WebCore/dom/UIEventWithKeyState.cpp
>===================================================================
>--- Source/WebCore/dom/UIEventWithKeyState.cpp	(revision 235539)
>+++ Source/WebCore/dom/UIEventWithKeyState.cpp	(working copy)
>@@ -27,17 +27,17 @@ auto UIEventWithKeyState::modifiersFromI
> {
>     OptionSet<Modifier> result;
>     if (initializer.ctrlKey)
>-        result |= Modifier::CtrlKey;
>+        result.add(Modifier::CtrlKey);
>     if (initializer.altKey)
>-        result |= Modifier::AltKey;
>+        result.add(Modifier::AltKey);
>     if (initializer.shiftKey)
>-        result |= Modifier::ShiftKey;
>+        result.add(Modifier::ShiftKey);
>     if (initializer.metaKey)
>-        result |= Modifier::MetaKey;
>+        result.add(Modifier::MetaKey);
>     if (initializer.modifierAltGraph)
>-        result |= Modifier::AltGraphKey;
>+        result.add(Modifier::AltGraphKey);
>     if (initializer.modifierCapsLock)
>-        result |= Modifier::CapsLockKey;
>+        result.add(Modifier::CapsLockKey);
>     return result;
> }
> 
>@@ -63,15 +63,15 @@ void UIEventWithKeyState::setModifierKey
> {
>     OptionSet<Modifier> result;
>     if (ctrlKey)
>-        result |= Modifier::CtrlKey;
>+        result.add(Modifier::CtrlKey);
>     if (altKey)
>-        result |= Modifier::AltKey;
>+        result.add(Modifier::AltKey);
>     if (shiftKey)
>-        result |= Modifier::ShiftKey;
>+        result.add(Modifier::ShiftKey);
>     if (metaKey)
>-        result |= Modifier::MetaKey;
>+        result.add(Modifier::MetaKey);
>     if (altGraphKey)
>-        result |= Modifier::AltGraphKey;
>+        result.add(Modifier::AltGraphKey);
>     m_modifiers = result;
> }
> 
>Index: Source/WebCore/dom/UserActionElementSet.cpp
>===================================================================
>--- Source/WebCore/dom/UserActionElementSet.cpp	(revision 235539)
>+++ Source/WebCore/dom/UserActionElementSet.cpp	(working copy)
>@@ -66,7 +66,10 @@ void UserActionElementSet::setFlags(Elem
> {
>     ASSERT(!flags.isEmpty());
> 
>-    m_elements.add(&element, OptionSet<Flag> { }).iterator->value |= flags;
>+    m_elements.ensure(&element, [] {
>+        return OptionSet<Flag>();
>+    }).iterator->value.add(flags);
>+
>     element.setUserActionElement(true);
> }
> 
>Index: Source/WebCore/editing/CompositeEditCommand.cpp
>===================================================================
>--- Source/WebCore/editing/CompositeEditCommand.cpp	(revision 235539)
>+++ Source/WebCore/editing/CompositeEditCommand.cpp	(working copy)
>@@ -1494,7 +1494,7 @@ void CompositeEditCommand::moveParagraph
>     ASSERT(endingSelection().isCaretOrRange());
>     OptionSet<ReplaceSelectionCommand::CommandOption> options { ReplaceSelectionCommand::SelectReplacement, ReplaceSelectionCommand::MovingParagraph };
>     if (!preserveStyle)
>-        options |= ReplaceSelectionCommand::MatchStyle;
>+        options.add(ReplaceSelectionCommand::MatchStyle);
>     applyCommandToComposite(ReplaceSelectionCommand::create(document(), WTFMove(fragment), options));
> 
>     frame().editor().markMisspellingsAndBadGrammar(endingSelection());
>Index: Source/WebCore/editing/Editor.cpp
>===================================================================
>--- Source/WebCore/editing/Editor.cpp	(revision 235539)
>+++ Source/WebCore/editing/Editor.cpp	(working copy)
>@@ -634,13 +634,13 @@ void Editor::replaceSelectionWithFragmen
> 
>     OptionSet<ReplaceSelectionCommand::CommandOption> options { ReplaceSelectionCommand::PreventNesting, ReplaceSelectionCommand::SanitizeFragment };
>     if (selectReplacement)
>-        options |= ReplaceSelectionCommand::SelectReplacement;
>+        options.add(ReplaceSelectionCommand::SelectReplacement);
>     if (smartReplace)
>-        options |= ReplaceSelectionCommand::SmartReplace;
>+        options.add(ReplaceSelectionCommand::SmartReplace);
>     if (matchStyle)
>-        options |= ReplaceSelectionCommand::MatchStyle;
>+        options.add(ReplaceSelectionCommand::MatchStyle);
>     if (mailBlockquoteHandling == MailBlockquoteHandling::IgnoreBlockquote)
>-        options |= ReplaceSelectionCommand::IgnoreMailBlockquote;
>+        options.add(ReplaceSelectionCommand::IgnoreMailBlockquote);
> 
>     auto command = ReplaceSelectionCommand::create(document(), &fragment, options, editingAction);
>     command->apply();
>@@ -1073,7 +1073,7 @@ void Editor::appliedEditing(CompositeEdi
>         // Don't clear the typing style with this selection change. We do those things elsewhere if necessary.
>         OptionSet<FrameSelection::SetSelectionOption> options;
>         if (command.isDictationCommand())
>-            options |= FrameSelection::DictationTriggered;
>+            options.add(FrameSelection::DictationTriggered);
> 
>         changeSelectionAfterCommand(newSelection, options);
>     }
>@@ -2339,7 +2339,7 @@ void Editor::markMisspellingsAfterTyping
>     UNUSED_PARAM(doReplacement);
>     OptionSet<TextCheckingType> textCheckingOptions;
>     if (isContinuousSpellCheckingEnabled())
>-        textCheckingOptions |= TextCheckingType::Spelling;
>+        textCheckingOptions.add(TextCheckingType::Spelling);
>     if (!textCheckingOptions.contains(TextCheckingType::Spelling))
>         return;
> 
>@@ -2357,7 +2357,7 @@ void Editor::markMisspellingsAfterTyping
>         OptionSet<TextCheckingType> textCheckingOptions;
> 
>         if (isContinuousSpellCheckingEnabled())
>-            textCheckingOptions |= TextCheckingType::Spelling;
>+            textCheckingOptions.add(TextCheckingType::Spelling);
> 
> #if USE(AUTOMATIC_TEXT_REPLACEMENT)
>         if (doReplacement
>@@ -2366,13 +2366,13 @@ void Editor::markMisspellingsAfterTyping
>                 || isAutomaticDashSubstitutionEnabled()
>                 || isAutomaticTextReplacementEnabled()
>                 || (textCheckingOptions.contains(TextCheckingType::Spelling) && isAutomaticSpellingCorrectionEnabled())))
>-            textCheckingOptions |= TextCheckingType::Replacement;
>+            textCheckingOptions.add(TextCheckingType::Replacement);
> #endif
>         if (!textCheckingOptions.contains(TextCheckingType::Spelling) && !textCheckingOptions.contains(TextCheckingType::Replacement))
>             return;
> 
>         if (isGrammarCheckingEnabled())
>-            textCheckingOptions |= TextCheckingType::Grammar;
>+            textCheckingOptions.add(TextCheckingType::Grammar);
> 
>         auto sentenceStart = startOfSentence(wordStart);
>         auto sentenceEnd = endOfSentence(wordStart);
>@@ -2838,7 +2838,7 @@ void Editor::markMisspellingsAndBadGramm
>         // markMisspellingsAndBadGrammar() is triggered by selection change, in which case we check spelling and grammar, but don't autocorrect misspellings.
>         OptionSet<TextCheckingType> textCheckingOptions { TextCheckingType::Spelling };
>         if (markGrammar && isGrammarCheckingEnabled())
>-            textCheckingOptions |= TextCheckingType::Grammar;
>+            textCheckingOptions.add(TextCheckingType::Grammar);
>         auto spellCheckingRange = spellingSelection.toNormalizedRange();
>         markAllMisspellingsAndBadGrammarInRanges(textCheckingOptions, spellCheckingRange.copyRef(), spellCheckingRange.copyRef(), grammarSelection.toNormalizedRange());
>         return;
>@@ -3733,30 +3733,30 @@ OptionSet<TextCheckingType> Editor::reso
> 
>     OptionSet<TextCheckingType> checkingTypes;
>     if (shouldMarkSpelling)
>-        checkingTypes |= TextCheckingType::Spelling;
>+        checkingTypes.add(TextCheckingType::Spelling);
>     if (shouldMarkGrammar)
>-        checkingTypes |= TextCheckingType::Grammar;
>+        checkingTypes.add(TextCheckingType::Grammar);
> #if !PLATFORM(IOS)
>     if (shouldCheckForCorrection)
>-        checkingTypes |= TextCheckingType::Correction;
>+        checkingTypes.add(TextCheckingType::Correction);
>     if (shouldShowCorrectionPanel)
>-        checkingTypes |= TextCheckingType::ShowCorrectionPanel;
>+        checkingTypes.add(TextCheckingType::ShowCorrectionPanel);
> 
> #if USE(AUTOMATIC_TEXT_REPLACEMENT)
>     bool shouldPerformReplacement = textCheckingOptions.contains(TextCheckingType::Replacement);
>     if (shouldPerformReplacement) {
>         if (!onlyAllowsTextReplacement) {
>             if (isAutomaticLinkDetectionEnabled())
>-                checkingTypes |= TextCheckingType::Link;
>+                checkingTypes.add(TextCheckingType::Link);
>             if (isAutomaticQuoteSubstitutionEnabled())
>-                checkingTypes |= TextCheckingType::Quote;
>+                checkingTypes.add(TextCheckingType::Quote);
>             if (isAutomaticDashSubstitutionEnabled())
>-                checkingTypes |= TextCheckingType::Dash;
>+                checkingTypes.add(TextCheckingType::Dash);
>             if (shouldMarkSpelling && isAutomaticSpellingCorrectionEnabled())
>-                checkingTypes |= TextCheckingType::Correction;
>+                checkingTypes.add(TextCheckingType::Correction);
>         }
>         if (isAutomaticTextReplacementEnabled())
>-            checkingTypes |= TextCheckingType::Replacement;
>+            checkingTypes.add(TextCheckingType::Replacement);
>     }
> #endif
> #endif // !PLATFORM(IOS)
>Index: Source/WebCore/editing/FrameSelection.cpp
>===================================================================
>--- Source/WebCore/editing/FrameSelection.cpp	(revision 235539)
>+++ Source/WebCore/editing/FrameSelection.cpp	(working copy)
>@@ -187,15 +187,15 @@ void FrameSelection::moveWithoutValidati
>     AXTextStateChangeIntent newIntent = intent.type == AXTextStateChangeTypeUnknown ? AXTextStateChangeIntent(AXTextStateChangeTypeSelectionMove, AXTextSelection { AXTextSelectionDirectionDiscontiguous, AXTextSelectionGranularityUnknown, false }) : intent;
>     auto options = defaultSetSelectionOptions();
>     if (!shouldSetFocus)
>-        options |= DoNotSetFocus;
>+        options.add(DoNotSetFocus);
>     switch (revealMode) {
>     case SelectionRevealMode::DoNotReveal:
>         break;
>     case SelectionRevealMode::Reveal:
>-        options |= RevealSelection;
>+        options.add(RevealSelection);
>         break;
>     case SelectionRevealMode::RevealUpToMainFrame:
>-        options |= RevealSelectionUpToMainFrame;
>+        options.add(RevealSelectionUpToMainFrame);
>         break;
>     }
>     setSelection(newSelection, options, newIntent);
>@@ -1995,7 +1995,7 @@ bool FrameSelection::setSelectedRange(Ra
> 
>     OptionSet<SetSelectionOption> selectionOptions {  ClearTypingStyle };
>     if (closeTyping)
>-        selectionOptions |= CloseTyping;
>+        selectionOptions.add(CloseTyping);
> 
>     if (userTriggered == UserTriggered) {
>         FrameSelection trialFrameSelection;
>@@ -2005,7 +2005,7 @@ bool FrameSelection::setSelectedRange(Ra
>         if (!shouldChangeSelection(trialFrameSelection.selection()))
>             return false;
> 
>-        selectionOptions |= IsUserTriggered;
>+        selectionOptions.add(IsUserTriggered);
>     }
> 
>     setSelection(newSelection, selectionOptions);
>Index: Source/WebCore/editing/FrameSelection.h
>===================================================================
>--- Source/WebCore/editing/FrameSelection.h	(revision 235539)
>+++ Source/WebCore/editing/FrameSelection.h	(working copy)
>@@ -133,7 +133,7 @@ public:
>     {
>         OptionSet<SetSelectionOption> options { CloseTyping, ClearTypingStyle };
>         if (userTriggered == UserTriggered)
>-            options |= { RevealSelection, FireSelectEvent, IsUserTriggered };
>+            options.add({ RevealSelection, FireSelectEvent, IsUserTriggered });
>         return options;
>     }
> 
>Index: Source/WebCore/editing/MoveSelectionCommand.cpp
>===================================================================
>--- Source/WebCore/editing/MoveSelectionCommand.cpp	(revision 235539)
>+++ Source/WebCore/editing/MoveSelectionCommand.cpp	(working copy)
>@@ -84,7 +84,7 @@ void MoveSelectionCommand::doApply()
>     }
>     OptionSet<ReplaceSelectionCommand::CommandOption> options { ReplaceSelectionCommand::SelectReplacement, ReplaceSelectionCommand::PreventNesting };
>     if (m_smartInsert)
>-        options |= ReplaceSelectionCommand::SmartReplace;
>+        options.add(ReplaceSelectionCommand::SmartReplace);
> 
>     {
>         auto replaceSelection = ReplaceSelectionCommand::create(document(), WTFMove(m_fragment), options, EditActionInsertFromDrop);
>Index: Source/WebCore/editing/SpellChecker.cpp
>===================================================================
>--- Source/WebCore/editing/SpellChecker.cpp	(revision 235539)
>+++ Source/WebCore/editing/SpellChecker.cpp	(working copy)
>@@ -218,9 +218,9 @@ void SpellChecker::didCheckSucceed(int s
>     if (requestData.sequence() == sequence) {
>         OptionSet<DocumentMarker::MarkerType> markerTypes;
>         if (requestData.checkingTypes().contains(TextCheckingType::Spelling))
>-            markerTypes |= DocumentMarker::Spelling;
>+            markerTypes.add(DocumentMarker::Spelling);
>         if (requestData.checkingTypes().contains(TextCheckingType::Grammar))
>-            markerTypes |= DocumentMarker::Grammar;
>+            markerTypes.add(DocumentMarker::Grammar);
>         if (!markerTypes.isEmpty())
>             m_frame.document()->markers().removeMarkers(&m_processingRequest->checkingRange(), markerTypes);
>     }
>Index: Source/WebCore/editing/TextCheckingHelper.cpp
>===================================================================
>--- Source/WebCore/editing/TextCheckingHelper.cpp	(revision 235539)
>+++ Source/WebCore/editing/TextCheckingHelper.cpp	(working copy)
>@@ -353,7 +353,7 @@ String TextCheckingHelper::findFirstMiss
>                 Vector<TextCheckingResult> results;
>                 OptionSet<TextCheckingType> checkingTypes { TextCheckingType::Spelling };
>                 if (checkGrammar)
>-                    checkingTypes |= TextCheckingType::Grammar;
>+                    checkingTypes.add(TextCheckingType::Grammar);
>                 VisibleSelection currentSelection;
>                 if (Frame* frame = paragraphRange->ownerDocument().frame())
>                     currentSelection = frame->selection().selection();
>@@ -587,7 +587,7 @@ Vector<String> TextCheckingHelper::guess
>     Vector<TextCheckingResult> results;
>     OptionSet<TextCheckingType> checkingTypes { TextCheckingType::Spelling };
>     if (checkGrammar)
>-        checkingTypes |= TextCheckingType::Grammar;
>+        checkingTypes.add(TextCheckingType::Grammar);
>     VisibleSelection currentSelection;
>     if (Frame* frame = m_range->ownerDocument().frame())
>         currentSelection = frame->selection().selection();
>Index: Source/WebCore/editing/TextIterator.cpp
>===================================================================
>--- Source/WebCore/editing/TextIterator.cpp	(revision 235539)
>+++ Source/WebCore/editing/TextIterator.cpp	(working copy)
>@@ -2097,7 +2097,7 @@ inline SearchBuffer::SearchBuffer(const 
>         // Characters in the separator category never really occur at the beginning of a word,
>         // so if the target begins with such a character, we just ignore the AtWordStart option.
>         if (isSeparator(targetFirstCharacter)) {
>-            m_options -= AtWordStarts;
>+            m_options.remove(AtWordStarts);
>             m_needsMoreContext = false;
>         }
>     }
>Index: Source/WebCore/html/HTMLAnchorElement.cpp
>===================================================================
>--- Source/WebCore/html/HTMLAnchorElement.cpp	(revision 235539)
>+++ Source/WebCore/html/HTMLAnchorElement.cpp	(working copy)
>@@ -257,9 +257,9 @@ void HTMLAnchorElement::parseAttribute(c
>         const bool shouldFoldCase = true;
>         SpaceSplitString relValue(value, shouldFoldCase);
>         if (relValue.contains(noReferrer))
>-            m_linkRelations |= Relation::NoReferrer;
>+            m_linkRelations.add(Relation::NoReferrer);
>         if (relValue.contains(noOpener))
>-            m_linkRelations |= Relation::NoOpener;
>+            m_linkRelations.add(Relation::NoOpener);
>         if (m_relList)
>             m_relList->associatedAttributeValueChanged(value);
>     }
>Index: Source/WebCore/inspector/agents/InspectorPageAgent.cpp
>===================================================================
>--- Source/WebCore/inspector/agents/InspectorPageAgent.cpp	(revision 235539)
>+++ Source/WebCore/inspector/agents/InspectorPageAgent.cpp	(working copy)
>@@ -319,9 +319,9 @@ void InspectorPageAgent::reload(ErrorStr
> 
>     OptionSet<ReloadOption> reloadOptions;
>     if (reloadFromOrigin)
>-        reloadOptions |= ReloadOption::FromOrigin;
>+        reloadOptions.add(ReloadOption::FromOrigin);
>     if (!revalidateAllResources)
>-        reloadOptions |= ReloadOption::ExpiredOnly;
>+        reloadOptions.add(ReloadOption::ExpiredOnly);
> 
>     m_page.mainFrame().loader().reload(reloadOptions);
> }
>Index: Source/WebCore/page/ContextMenuController.cpp
>===================================================================
>--- Source/WebCore/page/ContextMenuController.cpp	(revision 235539)
>+++ Source/WebCore/page/ContextMenuController.cpp	(working copy)
>@@ -369,7 +369,7 @@ void ContextMenuController::contextMenuI
>                 frame->selection().setSelection(wordSelection);
>             } else {
>                 ASSERT(frame->editor().selectedText().length());
>-                replaceOptions |= ReplaceSelectionCommand::SelectReplacement;
>+                replaceOptions.add(ReplaceSelectionCommand::SelectReplacement);
>             }
> 
>             Document* document = frame->document();
>Index: Source/WebCore/page/DOMWindow.cpp
>===================================================================
>--- Source/WebCore/page/DOMWindow.cpp	(revision 235539)
>+++ Source/WebCore/page/DOMWindow.cpp	(working copy)
>@@ -1221,14 +1221,14 @@ bool DOMWindow::find(const String& strin
>         return false;
> 
>     // FIXME (13016): Support wholeWord, searchInFrames and showDialog.    
>-    FindOptions options;
>+    FindOptions options { DoNotTraverseFlatTree };
>     if (backwards)
>-        options |= Backwards;
>+        options.add(Backwards);
>     if (!caseSensitive)
>-        options |= CaseInsensitive;
>+        options.add(CaseInsensitive);
>     if (wrap)
>-        options |= WrapAround;
>-    return m_frame->editor().findString(string, options | DoNotTraverseFlatTree);
>+        options.add(WrapAround);
>+    return m_frame->editor().findString(string, options);
> }
> 
> bool DOMWindow::offscreenBuffering() const
>Index: Source/WebCore/page/DragController.cpp
>===================================================================
>--- Source/WebCore/page/DragController.cpp	(revision 235539)
>+++ Source/WebCore/page/DragController.cpp	(working copy)
>@@ -619,9 +619,9 @@ bool DragController::concludeEditDrag(co
>             if (setSelectionToDragCaret(innerFrame.get(), dragCaret, range, point)) {
>                 OptionSet<ReplaceSelectionCommand::CommandOption> options { ReplaceSelectionCommand::SelectReplacement, ReplaceSelectionCommand::PreventNesting };
>                 if (dragData.canSmartReplace())
>-                    options |= ReplaceSelectionCommand::SmartReplace;
>+                    options.add(ReplaceSelectionCommand::SmartReplace);
>                 if (chosePlainText)
>-                    options |= ReplaceSelectionCommand::MatchStyle;
>+                    options.add(ReplaceSelectionCommand::MatchStyle);
>                 ReplaceSelectionCommand::create(*m_documentUnderMouse, fragment.releaseNonNull(), options, EditActionInsertFromDrop)->apply();
>             }
>         }
>Index: Source/WebCore/page/FrameSnapshotting.cpp
>===================================================================
>--- Source/WebCore/page/FrameSnapshotting.cpp	(revision 235539)
>+++ Source/WebCore/page/FrameSnapshotting.cpp	(working copy)
>@@ -92,13 +92,13 @@ std::unique_ptr<ImageBuffer> snapshotFra
> 
>     auto paintBehavior = state.paintBehavior;
>     if (options & SnapshotOptionsForceBlackText)
>-        paintBehavior |= PaintBehavior::ForceBlackText;
>+        paintBehavior.add(PaintBehavior::ForceBlackText);
>     if (options & SnapshotOptionsPaintSelectionOnly)
>-        paintBehavior |= PaintBehavior::SelectionOnly;
>+        paintBehavior.add(PaintBehavior::SelectionOnly);
>     if (options & SnapshotOptionsPaintSelectionAndBackgroundsOnly)
>-        paintBehavior |= PaintBehavior::SelectionAndBackgroundsOnly;
>+        paintBehavior.add(PaintBehavior::SelectionAndBackgroundsOnly);
>     if (options & SnapshotOptionsPaintEverythingExcludingSelection)
>-        paintBehavior |= PaintBehavior::ExcludeSelection;
>+        paintBehavior.add(PaintBehavior::ExcludeSelection);
> 
>     // Other paint behaviors are set by paintContentsForSnapshot.
>     frame.view()->setPaintBehavior(paintBehavior);
>Index: Source/WebCore/page/FrameView.cpp
>===================================================================
>--- Source/WebCore/page/FrameView.cpp	(revision 235539)
>+++ Source/WebCore/page/FrameView.cpp	(working copy)
>@@ -140,11 +140,11 @@ static OptionSet<RenderLayer::UpdateLaye
> {
>     auto flags = RenderLayer::updateLayerPositionsDefaultFlags();
>     if (didFullRepaint) {
>-        flags -= RenderLayer::CheckForRepaint;
>-        flags |= RenderLayer::NeedsFullRepaintInBacking;
>+        flags.remove(RenderLayer::CheckForRepaint);
>+        flags.add(RenderLayer::NeedsFullRepaintInBacking);
>     }
>     if (isRelayoutingSubtree && layer->enclosingPaginationLayer(RenderLayer::IncludeCompositedPaginatedLayers))
>-        flags |= RenderLayer::UpdatePagination;
>+        flags.add(RenderLayer::UpdatePagination);
>     return flags;
> }
> 
>@@ -4068,18 +4068,18 @@ void FrameView::willPaintContents(Graphi
>     
>     if (FrameView* parentView = parentFrameView()) {
>         if (parentView->paintBehavior() & PaintBehavior::FlattenCompositingLayers)
>-            m_paintBehavior |= PaintBehavior::FlattenCompositingLayers;
>+            m_paintBehavior.add(PaintBehavior::FlattenCompositingLayers);
>         
>         if (parentView->paintBehavior() & PaintBehavior::Snapshotting)
>-            m_paintBehavior |= PaintBehavior::Snapshotting;
>+            m_paintBehavior.add(PaintBehavior::Snapshotting);
>         
>         if (parentView->paintBehavior() & PaintBehavior::TileFirstPaint)
>-            m_paintBehavior |= PaintBehavior::TileFirstPaint;
>+            m_paintBehavior.add(PaintBehavior::TileFirstPaint);
>     }
> 
>     if (document->printing()) {
>-        m_paintBehavior |= PaintBehavior::FlattenCompositingLayers;
>-        m_paintBehavior |= PaintBehavior::Snapshotting;
>+        m_paintBehavior.add(PaintBehavior::FlattenCompositingLayers);
>+        m_paintBehavior.add(PaintBehavior::Snapshotting);
>     }
> 
>     paintingState.isFlatteningPaintOfRootFrame = (m_paintBehavior & PaintBehavior::FlattenCompositingLayers) && !frame().ownerElement();
>Index: Source/WebCore/page/Page.cpp
>===================================================================
>--- Source/WebCore/page/Page.cpp	(revision 235539)
>+++ Source/WebCore/page/Page.cpp	(working copy)
>@@ -1643,11 +1643,11 @@ void Page::setIsVisible(bool isVisible)
>     auto state = m_activityState;
> 
>     if (isVisible) {
>-        state -= ActivityState::IsVisuallyIdle;
>-        state |= { ActivityState::IsVisible, ActivityState::IsVisibleOrOccluded };
>+        state.remove(ActivityState::IsVisuallyIdle);
>+        state.add({ ActivityState::IsVisible, ActivityState::IsVisibleOrOccluded });
>     } else {
>-        state |= ActivityState::IsVisuallyIdle;
>-        state -= { ActivityState::IsVisible, ActivityState::IsVisibleOrOccluded };
>+        state.add(ActivityState::IsVisuallyIdle);
>+        state.remove({ ActivityState::IsVisible, ActivityState::IsVisibleOrOccluded });
>     }
>     setActivityState(state);
> }
>Index: Source/WebCore/page/PerformanceObserver.cpp
>===================================================================
>--- Source/WebCore/page/PerformanceObserver.cpp	(revision 235539)
>+++ Source/WebCore/page/PerformanceObserver.cpp	(working copy)
>@@ -65,7 +65,7 @@ ExceptionOr<void> PerformanceObserver::o
>     OptionSet<PerformanceEntry::Type> filter;
>     for (const String& entryType : init.entryTypes) {
>         if (auto type = PerformanceEntry::parseEntryTypeString(entryType))
>-            filter |= *type;
>+            filter.add(*type);
>     }
> 
>     if (filter.isEmpty())
>Index: Source/WebCore/page/TextIndicator.cpp
>===================================================================
>--- Source/WebCore/page/TextIndicator.cpp	(revision 235539)
>+++ Source/WebCore/page/TextIndicator.cpp	(working copy)
>@@ -78,8 +78,8 @@ RefPtr<TextIndicator> TextIndicator::cre
>     VisibleSelection oldSelection = frame->selection().selection();
>     OptionSet<TemporarySelectionOption> temporarySelectionOptions;
> #if PLATFORM(IOS)
>-    temporarySelectionOptions |= TemporarySelectionOptionIgnoreSelectionChanges;
>-    temporarySelectionOptions |= TemporarySelectionOptionEnableAppearanceUpdates;
>+    temporarySelectionOptions.add(TemporarySelectionOptionIgnoreSelectionChanges);
>+    temporarySelectionOptions.add(TemporarySelectionOptionEnableAppearanceUpdates);
> #endif
>     TemporarySelectionChange selectionChange(*frame, { range }, temporarySelectionOptions);
> 
>Index: Source/WebCore/page/WindowFeatures.cpp
>===================================================================
>--- Source/WebCore/page/WindowFeatures.cpp	(revision 235539)
>+++ Source/WebCore/page/WindowFeatures.cpp	(working copy)
>@@ -120,7 +120,7 @@ OptionSet<DisabledAdaptations> parseDisa
>     for (auto& name : disabledAdaptationsString.split(',')) {
>         auto normalizedName = name.stripWhiteSpace().convertToASCIILowercase();
>         if (normalizedName == watchAdaptationName())
>-            disabledAdaptations |= DisabledAdaptations::Watch;
>+            disabledAdaptations.add(DisabledAdaptations::Watch);
>     }
>     return disabledAdaptations;
> }
>Index: Source/WebCore/page/csp/ContentSecurityPolicy.h
>===================================================================
>--- Source/WebCore/page/csp/ContentSecurityPolicy.h	(revision 235539)
>+++ Source/WebCore/page/csp/ContentSecurityPolicy.h	(working copy)
>@@ -151,11 +151,11 @@ public:
>     void enforceSandboxFlags(SandboxFlags sandboxFlags) { m_sandboxFlags |= sandboxFlags; }
>     void addHashAlgorithmsForInlineScripts(OptionSet<ContentSecurityPolicyHashAlgorithm> hashAlgorithmsForInlineScripts)
>     {
>-        m_hashAlgorithmsForInlineScripts |= hashAlgorithmsForInlineScripts;
>+        m_hashAlgorithmsForInlineScripts.add(hashAlgorithmsForInlineScripts);
>     }
>     void addHashAlgorithmsForInlineStylesheets(OptionSet<ContentSecurityPolicyHashAlgorithm> hashAlgorithmsForInlineStylesheets)
>     {
>-        m_hashAlgorithmsForInlineStylesheets |= hashAlgorithmsForInlineStylesheets;
>+        m_hashAlgorithmsForInlineStylesheets.add(hashAlgorithmsForInlineStylesheets);
>     }
> 
>     // Used by ContentSecurityPolicySource
>Index: Source/WebCore/page/csp/ContentSecurityPolicySourceList.cpp
>===================================================================
>--- Source/WebCore/page/csp/ContentSecurityPolicySourceList.cpp	(revision 235539)
>+++ Source/WebCore/page/csp/ContentSecurityPolicySourceList.cpp	(working copy)
>@@ -473,7 +473,7 @@ bool ContentSecurityPolicySourceList::pa
>     if (digest->value.size() > ContentSecurityPolicyHash::maximumDigestLength)
>         return false;
> 
>-    m_hashAlgorithmsUsed |= digest->algorithm;
>+    m_hashAlgorithmsUsed.add(digest->algorithm);
>     m_hashes.add(WTFMove(*digest));
>     return true;
> }
>Index: Source/WebCore/platform/PlatformEvent.h
>===================================================================
>--- Source/WebCore/platform/PlatformEvent.h	(revision 235539)
>+++ Source/WebCore/platform/PlatformEvent.h	(working copy)
>@@ -115,13 +115,13 @@ protected:
>         , m_timestamp(timestamp)
>     {
>         if (shiftKey)
>-            m_modifiers |= Modifier::ShiftKey;
>+            m_modifiers.add(Modifier::ShiftKey);
>         if (ctrlKey)
>-            m_modifiers |= Modifier::CtrlKey;
>+            m_modifiers.add(Modifier::CtrlKey);
>         if (altKey)
>-            m_modifiers |= Modifier::AltKey;
>+            m_modifiers.add(Modifier::AltKey);
>         if (metaKey)
>-            m_modifiers |= Modifier::MetaKey;
>+            m_modifiers.add(Modifier::MetaKey);
>     }
> 
>     // Explicit protected destructor so that people don't accidentally
>Index: Source/WebCore/platform/ios/PlatformEventFactoryIOS.mm
>===================================================================
>--- Source/WebCore/platform/ios/PlatformEventFactoryIOS.mm	(revision 235539)
>+++ Source/WebCore/platform/ios/PlatformEventFactoryIOS.mm	(working copy)
>@@ -43,15 +43,15 @@ static OptionSet<PlatformEvent::Modifier
>     OptionSet<PlatformEvent::Modifier> modifiers;
> 
>     if (event.modifierFlags & WebEventFlagMaskShift)
>-        modifiers |= PlatformEvent::Modifier::ShiftKey;
>+        modifiers.add(PlatformEvent::Modifier::ShiftKey);
>     if (event.modifierFlags & WebEventFlagMaskControl)
>-        modifiers |= PlatformEvent::Modifier::CtrlKey;
>+        modifiers.add(PlatformEvent::Modifier::CtrlKey);
>     if (event.modifierFlags & WebEventFlagMaskAlternate)
>-        modifiers |= PlatformEvent::Modifier::AltKey;
>+        modifiers.add(PlatformEvent::Modifier::AltKey);
>     if (event.modifierFlags & WebEventFlagMaskCommand)
>-        modifiers |= PlatformEvent::Modifier::MetaKey;
>+        modifiers.add(PlatformEvent::Modifier::MetaKey);
>     if (event.modifierFlags & WebEventFlagMaskAlphaShift)
>-        modifiers |= PlatformEvent::Modifier::CapsLockKey;
>+        modifiers.add(PlatformEvent::Modifier::CapsLockKey);
> 
>     return modifiers;
> }
>Index: Source/WebCore/platform/mac/PlatformEventFactoryMac.mm
>===================================================================
>--- Source/WebCore/platform/mac/PlatformEventFactoryMac.mm	(revision 235539)
>+++ Source/WebCore/platform/mac/PlatformEventFactoryMac.mm	(working copy)
>@@ -666,15 +666,15 @@ OptionSet<PlatformEvent::Modifier> modif
>     OptionSet<PlatformEvent::Modifier> modifiers;
> 
>     if (event.modifierFlags & NSEventModifierFlagShift)
>-        modifiers |= PlatformEvent::Modifier::ShiftKey;
>+        modifiers.add(PlatformEvent::Modifier::ShiftKey);
>     if (event.modifierFlags & NSEventModifierFlagControl)
>-        modifiers |= PlatformEvent::Modifier::CtrlKey;
>+        modifiers.add(PlatformEvent::Modifier::CtrlKey);
>     if (event.modifierFlags & NSEventModifierFlagOption)
>-        modifiers |= PlatformEvent::Modifier::AltKey;
>+        modifiers.add(PlatformEvent::Modifier::AltKey);
>     if (event.modifierFlags & NSEventModifierFlagCommand)
>-        modifiers |= PlatformEvent::Modifier::MetaKey;
>+        modifiers.add(PlatformEvent::Modifier::MetaKey);
>     if (event.modifierFlags & NSEventModifierFlagCapsLock)
>-        modifiers |= PlatformEvent::Modifier::CapsLockKey;
>+        modifiers.add(PlatformEvent::Modifier::CapsLockKey);
> 
>     return modifiers;
> }
>Index: Source/WebCore/rendering/RenderLayer.cpp
>===================================================================
>--- Source/WebCore/rendering/RenderLayer.cpp	(revision 235539)
>+++ Source/WebCore/rendering/RenderLayer.cpp	(working copy)
>@@ -557,17 +557,17 @@ void RenderLayer::updateLayerPositions(R
>     // Clear the IsCompositingUpdateRoot flag once we've found the first compositing layer in this update.
>     bool isUpdateRoot = flags.contains(IsCompositingUpdateRoot);
>     if (isComposited())
>-        flags -= IsCompositingUpdateRoot;
>+        flags.remove(IsCompositingUpdateRoot);
> 
>     if (renderer().isInFlowRenderFragmentedFlow()) {
>         updatePagination();
>-        flags |= UpdatePagination;
>+        flags.add(UpdatePagination);
>     }
> 
>     if (transform()) {
>-        flags |= SeenTransformedLayer;
>+        flags.add(SeenTransformedLayer);
>         if (!transform()->isAffine())
>-            flags |= Seen3DTransformedLayer;
>+            flags.add(Seen3DTransformedLayer);
>     }
> 
>     for (RenderLayer* child = firstChild(); child; child = child->nextSibling())
>@@ -576,9 +576,9 @@ void RenderLayer::updateLayerPositions(R
>     if ((flags & UpdateCompositingLayers) && isComposited()) {
>         OptionSet<RenderLayerBacking::UpdateAfterLayoutFlags> updateFlags;
>         if (flags & NeedsFullRepaintInBacking)
>-            updateFlags |= RenderLayerBacking::UpdateAfterLayoutFlags::NeedsFullRepaint;
>+            updateFlags.add(RenderLayerBacking::UpdateAfterLayoutFlags::NeedsFullRepaint);
>         if (isUpdateRoot)
>-            updateFlags |= RenderLayerBacking::UpdateAfterLayoutFlags::IsUpdateRoot;
>+            updateFlags.add(RenderLayerBacking::UpdateAfterLayoutFlags::IsUpdateRoot);
>         backing()->updateAfterLayout(updateFlags);
>     }
>         
>@@ -851,16 +851,16 @@ void RenderLayer::updateLayerPositionsAf
> 
>     bool positionChanged = updateLayerPosition();
>     if (positionChanged)
>-        flags |= HasChangedAncestor;
>+        flags.add(HasChangedAncestor);
> 
>     if (flags.containsAny({ HasChangedAncestor, HasSeenViewportConstrainedAncestor, IsOverflowScroll }))
>         clearClipRects();
> 
>     if (renderer().style().hasViewportConstrainedPosition())
>-        flags |= HasSeenViewportConstrainedAncestor;
>+        flags.add(HasSeenViewportConstrainedAncestor);
> 
>     if (renderer().hasOverflowClip())
>-        flags |= HasSeenAncestorWithOverflowClip;
>+        flags.add(HasSeenAncestorWithOverflowClip);
>     
>     bool shouldComputeRepaintRects = (flags.contains(HasSeenViewportConstrainedAncestor) || flags.containsAll({ IsOverflowScroll, HasSeenAncestorWithOverflowClip })) && isSelfPaintingLayer();
>     bool isVisuallyEmpty = !isVisuallyNonEmpty();
>@@ -3973,7 +3973,7 @@ void RenderLayer::paintLayer(GraphicsCon
>         // The performingPaintInvalidation() painting pass goes through compositing layers,
>         // but we need to ensure that we don't cache clip rects computed with the wrong root in this case.
>         if (context.performingPaintInvalidation() || (paintingInfo.paintBehavior & PaintBehavior::FlattenCompositingLayers))
>-            paintFlags |= PaintLayerTemporaryClipRects;
>+            paintFlags.add(PaintLayerTemporaryClipRects);
>         else if (!backing()->paintsIntoWindow()
>             && !backing()->paintsIntoCompositedAncestor()
>             && !shouldDoSoftwarePaint(this, paintFlags.contains(PaintLayerPaintingReflection))
>@@ -4000,7 +4000,7 @@ void RenderLayer::paintLayer(GraphicsCon
>         return;
> 
>     if (paintsWithTransparency(paintingInfo.paintBehavior))
>-        paintFlags |= PaintLayerHaveTransparency;
>+        paintFlags.add(PaintLayerHaveTransparency);
> 
>     // PaintLayerAppliedTransform is used in RenderReplica, to avoid applying the transform twice.
>     if (paintsWithTransform(paintingInfo.paintBehavior) && !(paintFlags & PaintLayerAppliedTransform)) {
>@@ -4061,7 +4061,7 @@ void RenderLayer::paintLayerContentsAndR
>         m_paintingInsideReflection = false;
>     }
> 
>-    localPaintFlags |= paintLayerPaintingCompositingAllPhasesFlags();
>+    localPaintFlags.add(paintLayerPaintingCompositingAllPhasesFlags());
>     paintLayerContents(context, paintingInfo, localPaintFlags);
> }
> 
>@@ -4355,21 +4355,21 @@ void RenderLayer::paintLayerContents(Gra
> 
>         OptionSet<PaintBehavior> paintBehavior = PaintBehavior::Normal;
>         if (localPaintFlags & PaintLayerPaintingSkipRootBackground)
>-            paintBehavior |= PaintBehavior::SkipRootBackground;
>+            paintBehavior.add(PaintBehavior::SkipRootBackground);
>         else if (localPaintFlags & PaintLayerPaintingRootBackgroundOnly)
>-            paintBehavior |= PaintBehavior::RootBackgroundOnly;
>+            paintBehavior.add(PaintBehavior::RootBackgroundOnly);
> 
>         if (paintingInfo.paintBehavior & PaintBehavior::FlattenCompositingLayers)
>-            paintBehavior |= PaintBehavior::FlattenCompositingLayers;
>+            paintBehavior.add(PaintBehavior::FlattenCompositingLayers);
>         
>         if (paintingInfo.paintBehavior & PaintBehavior::Snapshotting)
>-            paintBehavior |= PaintBehavior::Snapshotting;
>+            paintBehavior.add(PaintBehavior::Snapshotting);
>         
>         if ((paintingInfo.paintBehavior & PaintBehavior::TileFirstPaint) && isRenderViewLayer())
>-            paintBehavior |= PaintBehavior::TileFirstPaint;
>+            paintBehavior.add(PaintBehavior::TileFirstPaint);
> 
>         if (paintingInfo.paintBehavior & PaintBehavior::ExcludeSelection)
>-            paintBehavior |= PaintBehavior::ExcludeSelection;
>+            paintBehavior.add(PaintBehavior::ExcludeSelection);
> 
>         LayoutRect paintDirtyRect = localPaintingInfo.paintDirtyRect;
>         if (shouldPaintContent || shouldPaintOutline || isPaintingOverlayScrollbars) {
>@@ -4438,13 +4438,13 @@ void RenderLayer::paintLayerContents(Gra
>     if (shouldPaintContent && !(selectionOnly || selectionAndBackgroundsOnly)) {
>         OptionSet<PaintBehavior> paintBehavior = PaintBehavior::Normal;
>         if (paintingInfo.paintBehavior & PaintBehavior::FlattenCompositingLayers)
>-            paintBehavior |= PaintBehavior::FlattenCompositingLayers;
>+            paintBehavior.add(PaintBehavior::FlattenCompositingLayers);
>         
>         if (paintingInfo.paintBehavior & PaintBehavior::Snapshotting)
>-            paintBehavior |= PaintBehavior::Snapshotting;
>+            paintBehavior.add(PaintBehavior::Snapshotting);
>         
>         if (paintingInfo.paintBehavior & PaintBehavior::TileFirstPaint)
>-            paintBehavior |= PaintBehavior::TileFirstPaint;
>+            paintBehavior.add(PaintBehavior::TileFirstPaint);
> 
>         if (shouldPaintMask(paintingInfo.paintBehavior, localPaintFlags)) {
>             // Paint the mask for the fragments.
>@@ -4770,13 +4770,13 @@ void RenderLayer::paintForegroundForFrag
>         localPaintBehavior = paintBehavior;
> 
>     if (localPaintingInfo.paintBehavior & PaintBehavior::ExcludeSelection)
>-        localPaintBehavior |= PaintBehavior::ExcludeSelection;
>+        localPaintBehavior.add(PaintBehavior::ExcludeSelection);
>     
>     if (localPaintingInfo.paintBehavior & PaintBehavior::Snapshotting)
>-        localPaintBehavior |= PaintBehavior::Snapshotting;
>+        localPaintBehavior.add(PaintBehavior::Snapshotting);
>     
>     if (localPaintingInfo.paintBehavior & PaintBehavior::TileFirstPaint)
>-        localPaintBehavior |= PaintBehavior::TileFirstPaint;
>+        localPaintBehavior.add(PaintBehavior::TileFirstPaint);
> 
>     // Optimize clipping for the single fragment case.
>     bool shouldClip = localPaintingInfo.clipToDirtyRect && layerFragments.size() == 1 && layerFragments[0].shouldPaintContent && !layerFragments[0].foregroundRect.isEmpty();
>Index: Source/WebCore/rendering/RenderLayerBacking.cpp
>===================================================================
>--- Source/WebCore/rendering/RenderLayerBacking.cpp	(revision 235539)
>+++ Source/WebCore/rendering/RenderLayerBacking.cpp	(working copy)
>@@ -2534,24 +2534,24 @@ void RenderLayerBacking::paintIntoLayer(
> 
>     OptionSet<RenderLayer::PaintLayerFlag> paintFlags;
>     if (paintingPhase & GraphicsLayerPaintBackground)
>-        paintFlags |= RenderLayer::PaintLayerPaintingCompositingBackgroundPhase;
>+        paintFlags.add(RenderLayer::PaintLayerPaintingCompositingBackgroundPhase);
>     if (paintingPhase & GraphicsLayerPaintForeground)
>-        paintFlags |= RenderLayer::PaintLayerPaintingCompositingForegroundPhase;
>+        paintFlags.add(RenderLayer::PaintLayerPaintingCompositingForegroundPhase);
>     if (paintingPhase & GraphicsLayerPaintMask)
>-        paintFlags |= RenderLayer::PaintLayerPaintingCompositingMaskPhase;
>+        paintFlags.add(RenderLayer::PaintLayerPaintingCompositingMaskPhase);
>     if (paintingPhase & GraphicsLayerPaintClipPath)
>-        paintFlags |= RenderLayer::PaintLayerPaintingCompositingClipPathPhase;
>+        paintFlags.add(RenderLayer::PaintLayerPaintingCompositingClipPathPhase);
>     if (paintingPhase & GraphicsLayerPaintChildClippingMask)
>-        paintFlags |= RenderLayer::PaintLayerPaintingChildClippingMaskPhase;
>+        paintFlags.add(RenderLayer::PaintLayerPaintingChildClippingMaskPhase);
>     if (paintingPhase & GraphicsLayerPaintOverflowContents)
>-        paintFlags |= RenderLayer::PaintLayerPaintingOverflowContents;
>+        paintFlags.add(RenderLayer::PaintLayerPaintingOverflowContents);
>     if (paintingPhase & GraphicsLayerPaintCompositedScroll)
>-        paintFlags |= RenderLayer::PaintLayerPaintingCompositingScrollingPhase;
>+        paintFlags.add(RenderLayer::PaintLayerPaintingCompositingScrollingPhase);
> 
>     if (graphicsLayer == m_backgroundLayer.get() && m_backgroundLayerPaintsFixedRootBackground)
>-        paintFlags |= { RenderLayer::PaintLayerPaintingRootBackgroundOnly, RenderLayer::PaintLayerPaintingCompositingForegroundPhase }; // Need PaintLayerPaintingCompositingForegroundPhase to walk child layers.
>+        paintFlags.add({ RenderLayer::PaintLayerPaintingRootBackgroundOnly, RenderLayer::PaintLayerPaintingCompositingForegroundPhase }); // Need PaintLayerPaintingCompositingForegroundPhase to walk child layers.
>     else if (compositor().fixedRootBackgroundLayer())
>-        paintFlags |= RenderLayer::PaintLayerPaintingSkipRootBackground;
>+        paintFlags.add(RenderLayer::PaintLayerPaintingSkipRootBackground);
> 
> #ifndef NDEBUG
>     RenderElement::SetLayoutNeededForbiddenScope forbidSetNeedsLayout(&renderer());
>@@ -2609,10 +2609,10 @@ void RenderLayerBacking::paintContents(c
>         // We have to use the same root as for hit testing, because both methods can compute and cache clipRects.
>         OptionSet<PaintBehavior> behavior = PaintBehavior::Normal;
>         if (layerPaintBehavior == GraphicsLayerPaintSnapshotting)
>-            behavior |= PaintBehavior::Snapshotting;
>+            behavior.add(PaintBehavior::Snapshotting);
>         
>         if (layerPaintBehavior == GraphicsLayerPaintFirstTilePaint)
>-            behavior |= PaintBehavior::TileFirstPaint;
>+            behavior.add(PaintBehavior::TileFirstPaint);
> 
>         paintIntoLayer(graphicsLayer, context, dirtyRect, behavior, paintingPhase);
> 
>Index: Source/WebCore/rendering/RenderLayerCompositor.cpp
>===================================================================
>--- Source/WebCore/rendering/RenderLayerCompositor.cpp	(revision 235539)
>+++ Source/WebCore/rendering/RenderLayerCompositor.cpp	(working copy)
>@@ -2164,89 +2164,89 @@ OptionSet<CompositingReason> RenderLayer
>     auto& renderer = rendererForCompositingTests(layer);
> 
>     if (requiresCompositingForTransform(renderer))
>-        reasons |= CompositingReason::Transform3D;
>+        reasons.add(CompositingReason::Transform3D);
> 
>     if (requiresCompositingForVideo(renderer))
>-        reasons |= CompositingReason::Video;
>+        reasons.add(CompositingReason::Video);
>     else if (requiresCompositingForCanvas(renderer))
>-        reasons |= CompositingReason::Canvas;
>+        reasons.add(CompositingReason::Canvas);
>     else if (requiresCompositingForPlugin(renderer))
>-        reasons |= CompositingReason::Plugin;
>+        reasons.add(CompositingReason::Plugin);
>     else if (requiresCompositingForFrame(renderer))
>-        reasons |= CompositingReason::IFrame;
>+        reasons.add(CompositingReason::IFrame);
> 
>     if ((canRender3DTransforms() && renderer.style().backfaceVisibility() == BackfaceVisibility::Hidden))
>-        reasons |= CompositingReason::BackfaceVisibilityHidden;
>+        reasons.add(CompositingReason::BackfaceVisibilityHidden);
> 
>     if (clipsCompositingDescendants(*renderer.layer()))
>-        reasons |= CompositingReason::ClipsCompositingDescendants;
>+        reasons.add(CompositingReason::ClipsCompositingDescendants);
> 
>     if (requiresCompositingForAnimation(renderer))
>-        reasons |= CompositingReason::Animation;
>+        reasons.add(CompositingReason::Animation);
> 
>     if (requiresCompositingForFilters(renderer))
>-        reasons |= CompositingReason::Filters;
>+        reasons.add(CompositingReason::Filters);
> 
>     if (requiresCompositingForWillChange(renderer))
>-        reasons |= CompositingReason::WillChange;
>+        reasons.add(CompositingReason::WillChange);
> 
>     if (requiresCompositingForPosition(renderer, *renderer.layer()))
>-        reasons |= renderer.isFixedPositioned() ? CompositingReason::PositionFixed : CompositingReason::PositionSticky;
>+        reasons.add(renderer.isFixedPositioned() ? CompositingReason::PositionFixed : CompositingReason::PositionSticky);
> 
> #if PLATFORM(IOS)
>     if (requiresCompositingForScrolling(*renderer.layer()))
>-        reasons |= CompositingReason::OverflowScrollingTouch;
>+        reasons.add(CompositingReason::OverflowScrollingTouch);
> #endif
> 
>     if (requiresCompositingForOverflowScrolling(*renderer.layer()))
>-        reasons |= CompositingReason::OverflowScrollingTouch;
>+        reasons.add(CompositingReason::OverflowScrollingTouch);
> 
>     switch (renderer.layer()->indirectCompositingReason()) {
>     case RenderLayer::IndirectCompositingReason::None:
>         break;
>     case RenderLayer::IndirectCompositingReason::Stacking:
>-        reasons |= CompositingReason::Stacking;
>+        reasons.add(CompositingReason::Stacking);
>         break;
>     case RenderLayer::IndirectCompositingReason::Overlap:
>-        reasons |= CompositingReason::Overlap;
>+        reasons.add(CompositingReason::Overlap);
>         break;
>     case RenderLayer::IndirectCompositingReason::BackgroundLayer:
>-        reasons |= CompositingReason::NegativeZIndexChildren;
>+        reasons.add(CompositingReason::NegativeZIndexChildren);
>         break;
>     case RenderLayer::IndirectCompositingReason::GraphicalEffect:
>         if (renderer.hasTransform())
>-            reasons |= CompositingReason::TransformWithCompositedDescendants;
>+            reasons.add(CompositingReason::TransformWithCompositedDescendants);
> 
>         if (renderer.isTransparent())
>-            reasons |= CompositingReason::OpacityWithCompositedDescendants;
>+            reasons.add(CompositingReason::OpacityWithCompositedDescendants);
> 
>         if (renderer.hasMask())
>-            reasons |= CompositingReason::MaskWithCompositedDescendants;
>+            reasons.add(CompositingReason::MaskWithCompositedDescendants);
> 
>         if (renderer.hasReflection())
>-            reasons |= CompositingReason::ReflectionWithCompositedDescendants;
>+            reasons.add(CompositingReason::ReflectionWithCompositedDescendants);
> 
>         if (renderer.hasFilter() || renderer.hasBackdropFilter())
>-            reasons |= CompositingReason::FilterWithCompositedDescendants;
>+            reasons.add(CompositingReason::FilterWithCompositedDescendants);
> 
> #if ENABLE(CSS_COMPOSITING)
>         if (layer.isolatesCompositedBlending())
>-            reasons |= CompositingReason::IsolatesCompositedBlendingDescendants;
>+            reasons.add(CompositingReason::IsolatesCompositedBlendingDescendants);
> 
>         if (layer.hasBlendMode())
>-            reasons |= CompositingReason::BlendingWithCompositedDescendants;
>+            reasons.add(CompositingReason::BlendingWithCompositedDescendants);
> #endif
>         break;
>     case RenderLayer::IndirectCompositingReason::Perspective:
>-        reasons |= CompositingReason::Perspective;
>+        reasons.add(CompositingReason::Perspective);
>         break;
>     case RenderLayer::IndirectCompositingReason::Preserve3D:
>-        reasons |= CompositingReason::Preserve3D;
>+        reasons.add(CompositingReason::Preserve3D);
>         break;
>     }
> 
>     if (inCompositingMode() && renderer.layer()->isRenderViewLayer())
>-        reasons |= CompositingReason::Root;
>+        reasons.add(CompositingReason::Root);
> 
>     return reasons;
> }
>@@ -3625,10 +3625,10 @@ void RenderLayerCompositor::updateScroll
> {
>     OptionSet<LayerScrollCoordinationRole> coordinationRoles;
>     if (isViewportConstrainedFixedOrStickyLayer(layer))
>-        coordinationRoles |= ViewportConstrained;
>+        coordinationRoles.add(ViewportConstrained);
> 
>     if (useCoordinatedScrollingForLayer(layer))
>-        coordinationRoles |= Scrolling;
>+        coordinationRoles.add(Scrolling);
> 
>     if (layer.isComposited())
>         layer.backing()->setIsScrollCoordinatedWithViewportConstrainedRole(coordinationRoles.contains(ViewportConstrained));
>Index: Source/WebCore/rendering/TextDecorationPainter.cpp
>===================================================================
>--- Source/WebCore/rendering/TextDecorationPainter.cpp	(revision 235539)
>+++ Source/WebCore/rendering/TextDecorationPainter.cpp	(working copy)
>@@ -383,17 +383,17 @@ static void collectStylesForRenderer(Tex
>         auto decorationStyle = style.textDecorationStyle();
> 
>         if (decorations.contains(TextDecoration::Underline)) {
>-            remainingDecorations -= TextDecoration::Underline;
>+            remainingDecorations.remove(TextDecoration::Underline);
>             result.underlineColor = color;
>             result.underlineStyle = decorationStyle;
>         }
>         if (decorations.contains(TextDecoration::Overline)) {
>-            remainingDecorations -= TextDecoration::Overline;
>+            remainingDecorations.remove(TextDecoration::Overline);
>             result.overlineColor = color;
>             result.overlineStyle = decorationStyle;
>         }
>         if (decorations.contains(TextDecoration::LineThrough)) {
>-            remainingDecorations -= TextDecoration::LineThrough;
>+            remainingDecorations.remove(TextDecoration::LineThrough);
>             result.linethroughColor = color;
>             result.linethroughStyle = decorationStyle;
>         }
>Index: Source/WebCore/rendering/TextPaintStyle.cpp
>===================================================================
>--- Source/WebCore/rendering/TextPaintStyle.cpp	(revision 235539)
>+++ Source/WebCore/rendering/TextPaintStyle.cpp	(working copy)
>@@ -100,7 +100,7 @@ TextPaintStyle computeTextPaintStyle(con
>         if (page && page->focusController().isActive()) {
>             OptionSet<StyleColor::Options> options;
>             if (page->useSystemAppearance())
>-                options |= StyleColor::Options::UseSystemAppearance;
>+                options.add(StyleColor::Options::UseSystemAppearance);
>             paintStyle.fillColor = RenderTheme::singleton().systemColor(CSSValueActivebuttontext, options);
>             return paintStyle;
>         }
>Index: Source/WebCore/rendering/style/RenderStyle.cpp
>===================================================================
>--- Source/WebCore/rendering/style/RenderStyle.cpp	(revision 235539)
>+++ Source/WebCore/rendering/style/RenderStyle.cpp	(working copy)
>@@ -613,7 +613,7 @@ bool RenderStyle::changeRequiresLayout(c
>             if (m_rareNonInheritedData->transform->hasTransform() != other.m_rareNonInheritedData->transform->hasTransform())
>                 return true;
>             if (*m_rareNonInheritedData->transform != *other.m_rareNonInheritedData->transform) {
>-                changedContextSensitiveProperties |= StyleDifferenceContextSensitiveProperty::Transform;
>+                changedContextSensitiveProperties.add(StyleDifferenceContextSensitiveProperty::Transform);
>                 // Don't return; keep looking for another change
>             }
>         }
>@@ -629,7 +629,7 @@ bool RenderStyle::changeRequiresLayout(c
> #endif
> 
>         if (!arePointingToEqualData(m_rareNonInheritedData->willChange, other.m_rareNonInheritedData->willChange)) {
>-            changedContextSensitiveProperties |= StyleDifferenceContextSensitiveProperty::WillChange;
>+            changedContextSensitiveProperties.add(StyleDifferenceContextSensitiveProperty::WillChange);
>             // Don't return; keep looking for another change
>         }
>     }
>@@ -849,7 +849,7 @@ bool RenderStyle::changeRequiresLayerRep
> 
>     if (position() != PositionType::Static) {
>         if (m_visualData->clip != other.m_visualData->clip || m_visualData->hasClip != other.m_visualData->hasClip) {
>-            changedContextSensitiveProperties |= StyleDifferenceContextSensitiveProperty::ClipRect;
>+            changedContextSensitiveProperties.add(StyleDifferenceContextSensitiveProperty::ClipRect);
>             return true;
>         }
>     }
>@@ -860,18 +860,18 @@ bool RenderStyle::changeRequiresLayerRep
> #endif
> 
>     if (m_rareNonInheritedData->opacity != other.m_rareNonInheritedData->opacity) {
>-        changedContextSensitiveProperties |= StyleDifferenceContextSensitiveProperty::Opacity;
>+        changedContextSensitiveProperties.add(StyleDifferenceContextSensitiveProperty::Opacity);
>         // Don't return; keep looking for another change.
>     }
> 
>     if (m_rareNonInheritedData->filter != other.m_rareNonInheritedData->filter) {
>-        changedContextSensitiveProperties |= StyleDifferenceContextSensitiveProperty::Filter;
>+        changedContextSensitiveProperties.add(StyleDifferenceContextSensitiveProperty::Filter);
>         // Don't return; keep looking for another change.
>     }
> 
> #if ENABLE(FILTERS_LEVEL_2)
>     if (m_rareNonInheritedData->backdropFilter != other.m_rareNonInheritedData->backdropFilter) {
>-        changedContextSensitiveProperties |= StyleDifferenceContextSensitiveProperty::Filter;
>+        changedContextSensitiveProperties.add(StyleDifferenceContextSensitiveProperty::Filter);
>         // Don't return; keep looking for another change.
>     }
> #endif
>@@ -921,7 +921,7 @@ bool RenderStyle::changeRequiresRepaint(
> 
>     // FIXME: this should probably be moved to changeRequiresLayerRepaint().
>     if (m_rareNonInheritedData->clipPath != other.m_rareNonInheritedData->clipPath) {
>-        changedContextSensitiveProperties |= StyleDifferenceContextSensitiveProperty::ClipPath;
>+        changedContextSensitiveProperties.add(StyleDifferenceContextSensitiveProperty::ClipPath);
>         // Don't return; keep looking for another change.
>     }
> 
>Index: Source/WebCore/testing/Internals.cpp
>===================================================================
>--- Source/WebCore/testing/Internals.cpp	(revision 235539)
>+++ Source/WebCore/testing/Internals.cpp	(working copy)
>@@ -2242,7 +2242,7 @@ static ExceptionOr<FindOptions> parseFin
>         bool found = false;
>         for (auto& flag : flagList) {
>             if (flag.name == option) {
>-                result |= flag.value;
>+                result.add(flag.value);
>                 found = true;
>                 break;
>             }
>@@ -3189,7 +3189,7 @@ void Internals::forceReload(bool endToEn
> {
>     OptionSet<ReloadOption> reloadOptions;
>     if (endToEnd)
>-        reloadOptions |= ReloadOption::FromOrigin;
>+        reloadOptions.add(ReloadOption::FromOrigin);
> 
>     frame()->loader().reload(reloadOptions);
> }
>@@ -4342,9 +4342,9 @@ void Internals::setPageVisibility(bool i
>     auto state = page.activityState();
> 
>     if (!isVisible)
>-        state -= ActivityState::IsVisible;
>+        state.remove(ActivityState::IsVisible);
>     else
>-        state |= ActivityState::IsVisible;
>+        state.add(ActivityState::IsVisible);
> 
>     page.setActivityState(state);
> }
>@@ -4358,9 +4358,9 @@ void Internals::setPageIsFocusedAndActiv
>     auto state = page.activityState();
> 
>     if (!isFocusedAndActive)
>-        state -= { ActivityState::IsFocused, ActivityState::WindowIsActive };
>+        state.remove({ ActivityState::IsFocused, ActivityState::WindowIsActive });
>     else
>-        state |= { ActivityState::IsFocused, ActivityState::WindowIsActive };
>+        state.add({ ActivityState::IsFocused, ActivityState::WindowIsActive });
> 
>     page.setActivityState(state);
> }
>Index: Source/WebDriver/Session.cpp
>===================================================================
>--- Source/WebDriver/Session.cpp	(revision 235539)
>+++ Source/WebDriver/Session.cpp	(working copy)
>@@ -1514,8 +1514,7 @@ void Session::elementClick(const String&
>         return;
>     }
> 
>-    OptionSet<ElementLayoutOption> options = ElementLayoutOption::ScrollIntoViewIfNeeded;
>-    options |= ElementLayoutOption::UseViewportCoordinates;
>+    OptionSet<ElementLayoutOption> options = { ElementLayoutOption::ScrollIntoViewIfNeeded, ElementLayoutOption::UseViewportCoordinates };
>     computeElementLayout(elementID, options, [this, protectedThis = makeRef(*this), elementID, completionHandler = WTFMove(completionHandler)](std::optional<Rect>&& rect, std::optional<Point>&& inViewCenter, bool isObscured, RefPtr<JSON::Object>&& error) mutable {
>         if (!rect || error) {
>             completionHandler(CommandResult::fail(WTFMove(error)));
>Index: Source/WebKit/ChangeLog
>===================================================================
>--- Source/WebKit/ChangeLog	(revision 235539)
>+++ Source/WebKit/ChangeLog	(working copy)
>@@ -1,3 +1,58 @@
>+2018-08-31  Antti Koivisto  <antti@apple.com>
>+
>+        Replace OptionSet |= and -= operators with add() and remove() functions
>+        https://bugs.webkit.org/show_bug.cgi?id=189169
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * NetworkProcess/cocoa/NetworkProcessCocoa.mm:
>+        (WebKit::NetworkProcess::platformInitializeNetworkProcessCocoa):
>+        * Shared/RemoteLayerTree/RemoteLayerTreeTransaction.h:
>+        (WebKit::RemoteLayerTreeTransaction::LayerProperties::notePropertiesChanged):
>+        * Shared/WebEventConversion.cpp:
>+        (WebKit::WebKit2PlatformMouseEvent::WebKit2PlatformMouseEvent):
>+        (WebKit::WebKit2PlatformWheelEvent::WebKit2PlatformWheelEvent):
>+        (WebKit::WebKit2PlatformKeyboardEvent::WebKit2PlatformKeyboardEvent):
>+        (WebKit::WebKit2PlatformTouchEvent::WebKit2PlatformTouchEvent):
>+        (WebKit::WebKit2PlatformGestureEvent::WebKit2PlatformGestureEvent):
>+        * Shared/WebsitePoliciesData.cpp:
>+        (WebKit::WebsitePoliciesData::applyToDocumentLoader):
>+        * UIProcess/API/C/WKPage.cpp:
>+        (WKPageReload):
>+        * UIProcess/API/C/WKResourceCacheManager.cpp:
>+        (toWebsiteDataTypes):
>+        * UIProcess/API/C/WKWebsitePolicies.cpp:
>+        (WKWebsitePoliciesSetAllowedAutoplayQuirks):
>+        * UIProcess/API/Cocoa/WKWebView.mm:
>+        (-[WKWebView reload]):
>+        * UIProcess/API/Cocoa/WKWebsiteDataRecordInternal.h:
>+        (WebKit::toWebsiteDataTypes):
>+        * UIProcess/API/Cocoa/WKWebsiteDataStore.mm:
>+        (-[WKWebsiteDataStore _fetchDataRecordsOfTypes:withOptions:completionHandler:]):
>+        * UIProcess/API/Cocoa/_WKWebsitePolicies.mm:
>+        (-[_WKWebsitePolicies setAllowedAutoplayQuirks:]):
>+        * UIProcess/Cocoa/WebViewImpl.mm:
>+        (WebKit::WebViewImpl::viewDidMoveToWindow):
>+        * UIProcess/WebPageProxy.cpp:
>+        (WebKit::WebPageProxy::updateActivityState):
>+        (WebKit::WebPageProxy::activityStateDidChange):
>+        (WebKit::WebPageProxy::dispatchActivityStateChange):
>+        * UIProcess/WebsiteData/WebsiteDataRecord.cpp:
>+        (WebKit::WebsiteDataRecord::add):
>+        (WebKit::WebsiteDataRecord::addCookieHostName):
>+        (WebKit::WebsiteDataRecord::addPluginDataHostName):
>+        (WebKit::WebsiteDataRecord::addHSTSCacheHostname):
>+        (WebKit::WebsiteDataRecord::addOriginWithCredential):
>+        * UIProcess/mac/WKInspectorViewController.mm:
>+        (-[WKInspectorViewController inspectorWKWebViewReload:]):
>+        * WebProcess/InjectedBundle/DOM/InjectedBundleNodeHandle.cpp:
>+        (WebKit::imageForRect):
>+        * WebProcess/InjectedBundle/DOM/InjectedBundleRangeHandle.cpp:
>+        (WebKit::InjectedBundleRangeHandle::renderedImage):
>+        * WebProcess/WebPage/FindController.cpp:
>+        (WebKit::core):
>+        (WebKit::FindController::findString):
>+
> 2018-08-31  Frederic Wang  <fwang@igalia.com>
> 
>         Bug 182053 - [CSSOM View] Implement standard behavior for scrollingElement
>Index: Source/WebKit/NetworkProcess/cocoa/NetworkProcessCocoa.mm
>===================================================================
>--- Source/WebKit/NetworkProcess/cocoa/NetworkProcessCocoa.mm	(revision 235539)
>+++ Source/WebKit/NetworkProcess/cocoa/NetworkProcessCocoa.mm	(working copy)
>@@ -114,12 +114,12 @@ void NetworkProcess::platformInitializeN
>     SandboxExtension::consumePermanently(parameters.diskCacheDirectoryExtensionHandle);
>     OptionSet<NetworkCache::Cache::Option> cacheOptions { NetworkCache::Cache::Option::RegisterNotify };
>     if (parameters.shouldEnableNetworkCacheEfficacyLogging)
>-        cacheOptions |= NetworkCache::Cache::Option::EfficacyLogging;
>+        cacheOptions.add(NetworkCache::Cache::Option::EfficacyLogging);
>     if (parameters.shouldUseTestingNetworkSession)
>-        cacheOptions |= NetworkCache::Cache::Option::TestingMode;
>+        cacheOptions.add(NetworkCache::Cache::Option::TestingMode);
> #if ENABLE(NETWORK_CACHE_SPECULATIVE_REVALIDATION)
>     if (parameters.shouldEnableNetworkCacheSpeculativeRevalidation)
>-        cacheOptions |= NetworkCache::Cache::Option::SpeculativeRevalidation;
>+        cacheOptions.add(NetworkCache::Cache::Option::SpeculativeRevalidation);
> #endif
> 
>     m_cache = NetworkCache::Cache::open(m_diskCacheDirectory, cacheOptions);
>Index: Source/WebKit/Shared/WebEventConversion.cpp
>===================================================================
>--- Source/WebKit/Shared/WebEventConversion.cpp	(revision 235539)
>+++ Source/WebKit/Shared/WebEventConversion.cpp	(working copy)
>@@ -69,15 +69,15 @@ public:
>         }
> 
>         if (webEvent.shiftKey())
>-            m_modifiers |= Modifier::ShiftKey;
>+            m_modifiers.add(Modifier::ShiftKey);
>         if (webEvent.controlKey())
>-            m_modifiers |= Modifier::CtrlKey;
>+            m_modifiers.add(Modifier::CtrlKey);
>         if (webEvent.altKey())
>-            m_modifiers |= Modifier::AltKey;
>+            m_modifiers.add(Modifier::AltKey);
>         if (webEvent.metaKey())
>-            m_modifiers |= Modifier::MetaKey;
>+            m_modifiers.add(Modifier::MetaKey);
>         if (webEvent.capsLockKey())
>-            m_modifiers |= Modifier::CapsLockKey;
>+            m_modifiers.add(Modifier::CapsLockKey);
> 
>         m_timestamp = webEvent.timestamp();
> 
>@@ -136,15 +136,15 @@ public:
>         m_type = PlatformEvent::Wheel;
> 
>         if (webEvent.shiftKey())
>-            m_modifiers |= Modifier::ShiftKey;
>+            m_modifiers.add(Modifier::ShiftKey);
>         if (webEvent.controlKey())
>-            m_modifiers |= Modifier::CtrlKey;
>+            m_modifiers.add(Modifier::CtrlKey);
>         if (webEvent.altKey())
>-            m_modifiers |= Modifier::AltKey;
>+            m_modifiers.add(Modifier::AltKey);
>         if (webEvent.metaKey())
>-            m_modifiers |= Modifier::MetaKey;
>+            m_modifiers.add(Modifier::MetaKey);
>         if (webEvent.capsLockKey())
>-            m_modifiers |= Modifier::CapsLockKey;
>+            m_modifiers.add(Modifier::CapsLockKey);
> 
>         m_timestamp = webEvent.timestamp();
> 
>@@ -198,15 +198,15 @@ public:
>         }
> 
>         if (webEvent.shiftKey())
>-            m_modifiers |= Modifier::ShiftKey;
>+            m_modifiers.add(Modifier::ShiftKey);
>         if (webEvent.controlKey())
>-            m_modifiers |= Modifier::CtrlKey;
>+            m_modifiers.add(Modifier::CtrlKey);
>         if (webEvent.altKey())
>-            m_modifiers |= Modifier::AltKey;
>+            m_modifiers.add(Modifier::AltKey);
>         if (webEvent.metaKey())
>-            m_modifiers |= Modifier::MetaKey;
>+            m_modifiers.add(Modifier::MetaKey);
>         if (webEvent.capsLockKey())
>-            m_modifiers |= Modifier::CapsLockKey;
>+            m_modifiers.add(Modifier::CapsLockKey);
> 
>         m_timestamp = webEvent.timestamp();
> 
>@@ -339,15 +339,15 @@ public:
>         }
> 
>         if (webEvent.shiftKey())
>-            m_modifiers |= Modifier::ShiftKey;
>+            m_modifiers.add(Modifier::ShiftKey);
>         if (webEvent.controlKey())
>-            m_modifiers |= Modifier::CtrlKey;
>+            m_modifiers.add(Modifier::CtrlKey);
>         if (webEvent.altKey())
>-            m_modifiers |= Modifier::AltKey;
>+            m_modifiers.add(Modifier::AltKey);
>         if (webEvent.metaKey())
>-            m_modifiers |= Modifier::MetaKey;
>+            m_modifiers.add(Modifier::MetaKey);
>         if (webEvent.capsLockKey())
>-            m_modifiers |= Modifier::CapsLockKey;
>+            m_modifiers.add(Modifier::CapsLockKey);
> 
>         m_timestamp = webEvent.timestamp();
> 
>@@ -398,15 +398,15 @@ public:
>         }
> 
>         if (webEvent.shiftKey())
>-            m_modifiers |= Modifier::ShiftKey;
>+            m_modifiers.add(Modifier::ShiftKey);
>         if (webEvent.controlKey())
>-            m_modifiers |= Modifier::CtrlKey;
>+            m_modifiers.add(Modifier::CtrlKey);
>         if (webEvent.altKey())
>-            m_modifiers |= Modifier::AltKey;
>+            m_modifiers.add(Modifier::AltKey);
>         if (webEvent.metaKey())
>-            m_modifiers |= Modifier::MetaKey;
>+            m_modifiers.add(Modifier::MetaKey);
>         if (webEvent.capsLockKey())
>-            m_modifiers |= Modifier::CapsLockKey;
>+            m_modifiers.add(Modifier::CapsLockKey);
> 
>         m_timestamp = webEvent.timestamp();
> 
>Index: Source/WebKit/Shared/WebsitePoliciesData.cpp
>===================================================================
>--- Source/WebKit/Shared/WebsitePoliciesData.cpp	(revision 235539)
>+++ Source/WebKit/Shared/WebsitePoliciesData.cpp	(working copy)
>@@ -98,13 +98,13 @@ void WebsitePoliciesData::applyToDocumen
>     const auto& allowedQuirks = websitePolicies.allowedAutoplayQuirks;
>     
>     if (allowedQuirks.contains(WebsiteAutoplayQuirk::InheritedUserGestures))
>-        quirks |= WebCore::AutoplayQuirk::InheritedUserGestures;
>+        quirks.add(WebCore::AutoplayQuirk::InheritedUserGestures);
>     
>     if (allowedQuirks.contains(WebsiteAutoplayQuirk::SynthesizedPauseEvents))
>-        quirks |= WebCore::AutoplayQuirk::SynthesizedPauseEvents;
>+        quirks.add(WebCore::AutoplayQuirk::SynthesizedPauseEvents);
>     
>     if (allowedQuirks.contains(WebsiteAutoplayQuirk::ArbitraryUserGestures))
>-        quirks |= WebCore::AutoplayQuirk::ArbitraryUserGestures;
>+        quirks.add(WebCore::AutoplayQuirk::ArbitraryUserGestures);
> 
>     documentLoader.setAllowedAutoplayQuirks(quirks);
> 
>Index: Source/WebKit/Shared/RemoteLayerTree/RemoteLayerTreeTransaction.h
>===================================================================
>--- Source/WebKit/Shared/RemoteLayerTree/RemoteLayerTreeTransaction.h	(revision 235539)
>+++ Source/WebKit/Shared/RemoteLayerTree/RemoteLayerTreeTransaction.h	(working copy)
>@@ -116,7 +116,7 @@ public:
> 
>         void notePropertiesChanged(OptionSet<LayerChange> changeFlags)
>         {
>-            changedProperties |= changeFlags;
>+            changedProperties.add(changeFlags);
>         }
> 
>         void resetChangedProperties()
>Index: Source/WebKit/UIProcess/WebPageProxy.cpp
>===================================================================
>--- Source/WebKit/UIProcess/WebPageProxy.cpp	(revision 235539)
>+++ Source/WebKit/UIProcess/WebPageProxy.cpp	(working copy)
>@@ -1446,32 +1446,32 @@ void WebPageProxy::setSuppressVisibility
> 
> void WebPageProxy::updateActivityState(OptionSet<ActivityState::Flag> flagsToUpdate)
> {
>-    m_activityState = m_activityState - flagsToUpdate;
>+    m_activityState.remove(flagsToUpdate);
>     if (flagsToUpdate & ActivityState::IsFocused && m_pageClient.isViewFocused())
>-        m_activityState |= ActivityState::IsFocused;
>+        m_activityState.add(ActivityState::IsFocused);
>     if (flagsToUpdate & ActivityState::WindowIsActive && m_pageClient.isViewWindowActive())
>-        m_activityState |= ActivityState::WindowIsActive;
>+        m_activityState.add(ActivityState::WindowIsActive);
>     if (flagsToUpdate & ActivityState::IsVisible && m_pageClient.isViewVisible())
>-        m_activityState |= ActivityState::IsVisible;
>+        m_activityState.add(ActivityState::IsVisible);
>     if (flagsToUpdate & ActivityState::IsVisibleOrOccluded && m_pageClient.isViewVisibleOrOccluded())
>-        m_activityState |= ActivityState::IsVisibleOrOccluded;
>+        m_activityState.add(ActivityState::IsVisibleOrOccluded);
>     if (flagsToUpdate & ActivityState::IsInWindow && m_pageClient.isViewInWindow())
>-        m_activityState |= ActivityState::IsInWindow;
>+        m_activityState.add(ActivityState::IsInWindow);
>     if (flagsToUpdate & ActivityState::IsVisuallyIdle && m_pageClient.isVisuallyIdle())
>-        m_activityState |= ActivityState::IsVisuallyIdle;
>+        m_activityState.add(ActivityState::IsVisuallyIdle);
>     if (flagsToUpdate & ActivityState::IsAudible && m_mediaState & MediaProducer::IsPlayingAudio && !(m_mutedState & MediaProducer::AudioIsMuted))
>-        m_activityState |= ActivityState::IsAudible;
>+        m_activityState.add(ActivityState::IsAudible);
>     if (flagsToUpdate & ActivityState::IsLoading && m_pageLoadState.isLoading())
>-        m_activityState |= ActivityState::IsLoading;
>+        m_activityState.add(ActivityState::IsLoading);
>     if (flagsToUpdate & ActivityState::IsCapturingMedia && m_mediaState & (MediaProducer::HasActiveAudioCaptureDevice | MediaProducer::HasActiveVideoCaptureDevice))
>-        m_activityState |= ActivityState::IsCapturingMedia;
>+        m_activityState.add(ActivityState::IsCapturingMedia);
> }
> 
> void WebPageProxy::activityStateDidChange(OptionSet<ActivityState::Flag> mayHaveChanged, bool wantsSynchronousReply, ActivityStateChangeDispatchMode dispatchMode)
> {
>     LOG_WITH_STREAM(ActivityState, stream << "WebPageProxy " << pageID() << " activityStateDidChange - mayHaveChanged " << mayHaveChanged);
> 
>-    m_potentiallyChangedActivityStateFlags |= mayHaveChanged;
>+    m_potentiallyChangedActivityStateFlags.add(mayHaveChanged);
>     m_activityStateChangeWantsSynchronousReply = m_activityStateChangeWantsSynchronousReply || wantsSynchronousReply;
> 
>     if (m_suppressVisibilityUpdates && dispatchMode != ActivityStateChangeDispatchMode::Immediate)
>@@ -1522,7 +1522,7 @@ void WebPageProxy::dispatchActivityState
> 
>     // If the visibility state may have changed, then so may the visually idle & occluded agnostic state.
>     if (m_potentiallyChangedActivityStateFlags & ActivityState::IsVisible)
>-        m_potentiallyChangedActivityStateFlags |= { ActivityState::IsVisibleOrOccluded, ActivityState::IsVisuallyIdle };
>+        m_potentiallyChangedActivityStateFlags.add({ ActivityState::IsVisibleOrOccluded, ActivityState::IsVisuallyIdle });
> 
>     // Record the prior view state, update the flags that may have changed,
>     // and check which flags have actually changed.
>Index: Source/WebKit/UIProcess/API/C/WKPage.cpp
>===================================================================
>--- Source/WebKit/UIProcess/API/C/WKPage.cpp	(revision 235539)
>+++ Source/WebKit/UIProcess/API/C/WKPage.cpp	(working copy)
>@@ -270,7 +270,7 @@ void WKPageReload(WKPageRef pageRef)
>     OptionSet<WebCore::ReloadOption> reloadOptions;
> #if PLATFORM(COCOA)
>     if (linkedOnOrAfter(WebKit::SDKVersion::FirstWithExpiredOnlyReloadBehavior))
>-        reloadOptions |= WebCore::ReloadOption::ExpiredOnly;
>+        reloadOptions.add(WebCore::ReloadOption::ExpiredOnly);
> #endif
> 
>     toImpl(pageRef)->reload(reloadOptions);
>Index: Source/WebKit/UIProcess/API/C/WKResourceCacheManager.cpp
>===================================================================
>--- Source/WebKit/UIProcess/API/C/WKResourceCacheManager.cpp	(revision 235539)
>+++ Source/WebKit/UIProcess/API/C/WKResourceCacheManager.cpp	(working copy)
>@@ -40,12 +40,10 @@ WKTypeID WKResourceCacheManagerGetTypeID
> 
> static OptionSet<WebsiteDataType> toWebsiteDataTypes(WKResourceCachesToClear cachesToClear)
> {
>-    OptionSet<WebsiteDataType> websiteDataTypes;
>-
>-    websiteDataTypes |= WebsiteDataType::MemoryCache;
>+    OptionSet<WebsiteDataType> websiteDataTypes { WebsiteDataType::MemoryCache };
> 
>     if (cachesToClear == WKResourceCachesToClearAll)
>-        websiteDataTypes |= WebsiteDataType::DiskCache;
>+        websiteDataTypes.add(WebsiteDataType::DiskCache);
> 
>     return websiteDataTypes;
> }
>Index: Source/WebKit/UIProcess/API/C/WKWebsitePolicies.cpp
>===================================================================
>--- Source/WebKit/UIProcess/API/C/WKWebsitePolicies.cpp	(revision 235539)
>+++ Source/WebKit/UIProcess/API/C/WKWebsitePolicies.cpp	(working copy)
>@@ -83,13 +83,13 @@ void WKWebsitePoliciesSetAllowedAutoplay
> {
>     OptionSet<WebsiteAutoplayQuirk> quirks;
>     if (allowedQuirks & kWKWebsiteAutoplayQuirkInheritedUserGestures)
>-        quirks |= WebsiteAutoplayQuirk::InheritedUserGestures;
>+        quirks.add(WebsiteAutoplayQuirk::InheritedUserGestures);
> 
>     if (allowedQuirks & kWKWebsiteAutoplayQuirkSynthesizedPauseEvents)
>-        quirks |= WebsiteAutoplayQuirk::SynthesizedPauseEvents;
>+        quirks.add(WebsiteAutoplayQuirk::SynthesizedPauseEvents);
> 
>     if (allowedQuirks & kWKWebsiteAutoplayQuirkArbitraryUserGestures)
>-        quirks |= WebsiteAutoplayQuirk::ArbitraryUserGestures;
>+        quirks.add(WebsiteAutoplayQuirk::ArbitraryUserGestures);
> 
>     toImpl(websitePolicies)->setAllowedAutoplayQuirks(quirks);
> }
>Index: Source/WebKit/UIProcess/API/C/wpe/WKAPICastWPE.h
>===================================================================
>--- Source/WebKit/UIProcess/API/C/wpe/WKAPICastWPE.h	(revision 235539)
>+++ Source/WebKit/UIProcess/API/C/wpe/WKAPICastWPE.h	(working copy)
>@@ -53,9 +53,9 @@ inline OptionSet<WebCore::ActivityState:
>     OptionSet<WebCore::ActivityState::Flag> viewStateFlags;
> 
>     if (wkViewState & kWKViewStateIsInWindow)
>-        viewStateFlags |= WebCore::ActivityState::IsInWindow;
>+        viewStateFlags.add(WebCore::ActivityState::IsInWindow);
>     if (wkViewState & kWKViewStateIsVisible)
>-        viewStateFlags |= WebCore::ActivityState::IsVisible;
>+        viewStateFlags.add(WebCore::ActivityState::IsVisible);
> 
>     return viewStateFlags;
> }
>Index: Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm
>===================================================================
>--- Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm	(revision 235539)
>+++ Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm	(working copy)
>@@ -961,7 +961,7 @@ - (WKNavigation *)reload
> {
>     OptionSet<WebCore::ReloadOption> reloadOptions;
>     if (linkedOnOrAfter(WebKit::SDKVersion::FirstWithExpiredOnlyReloadBehavior))
>-        reloadOptions |= WebCore::ReloadOption::ExpiredOnly;
>+        reloadOptions.add(WebCore::ReloadOption::ExpiredOnly);
> 
>     return wrapper(_page->reload(reloadOptions));
> }
>Index: Source/WebKit/UIProcess/API/Cocoa/WKWebsiteDataRecordInternal.h
>===================================================================
>--- Source/WebKit/UIProcess/API/Cocoa/WKWebsiteDataRecordInternal.h	(revision 235539)
>+++ Source/WebKit/UIProcess/API/Cocoa/WKWebsiteDataRecordInternal.h	(working copy)
>@@ -85,7 +85,7 @@ static inline OptionSet<WebKit::WebsiteD
> 
>     for (NSString *websiteDataType in websiteDataTypes) {
>         if (auto dataType = toWebsiteDataType(websiteDataType))
>-            result |= *dataType;
>+            result.add(*dataType);
>     }
> 
>     return result;
>Index: Source/WebKit/UIProcess/API/Cocoa/WKWebsiteDataStore.mm
>===================================================================
>--- Source/WebKit/UIProcess/API/Cocoa/WKWebsiteDataStore.mm	(revision 235539)
>+++ Source/WebKit/UIProcess/API/Cocoa/WKWebsiteDataStore.mm	(working copy)
>@@ -223,7 +223,7 @@ - (void)_fetchDataRecordsOfTypes:(NSSet<
> 
>     OptionSet<WebKit::WebsiteDataFetchOption> fetchOptions;
>     if (options & _WKWebsiteDataStoreFetchOptionComputeSizes)
>-        fetchOptions |= WebKit::WebsiteDataFetchOption::ComputeSizes;
>+        fetchOptions.add(WebKit::WebsiteDataFetchOption::ComputeSizes);
> 
>     _websiteDataStore->websiteDataStore().fetchData(WebKit::toWebsiteDataTypes(dataTypes), fetchOptions, [completionHandlerCopy = WTFMove(completionHandlerCopy)](auto websiteDataRecords) {
>         Vector<RefPtr<API::Object>> elements;
>Index: Source/WebKit/UIProcess/API/Cocoa/_WKWebsitePolicies.mm
>===================================================================
>--- Source/WebKit/UIProcess/API/Cocoa/_WKWebsitePolicies.mm	(revision 235539)
>+++ Source/WebKit/UIProcess/API/Cocoa/_WKWebsitePolicies.mm	(working copy)
>@@ -64,13 +64,13 @@ - (void)setAllowedAutoplayQuirks:(_WKWeb
>     OptionSet<WebKit::WebsiteAutoplayQuirk> quirks;
> 
>     if (allowedQuirks & _WKWebsiteAutoplayQuirkInheritedUserGestures)
>-        quirks |= WebKit::WebsiteAutoplayQuirk::InheritedUserGestures;
>+        quirks.add(WebKit::WebsiteAutoplayQuirk::InheritedUserGestures);
> 
>     if (allowedQuirks & _WKWebsiteAutoplayQuirkSynthesizedPauseEvents)
>-        quirks |= WebKit::WebsiteAutoplayQuirk::SynthesizedPauseEvents;
>+        quirks.add(WebKit::WebsiteAutoplayQuirk::SynthesizedPauseEvents);
> 
>     if (allowedQuirks & _WKWebsiteAutoplayQuirkArbitraryUserGestures)
>-        quirks |= WebKit::WebsiteAutoplayQuirk::ArbitraryUserGestures;
>+        quirks.add(WebKit::WebsiteAutoplayQuirk::ArbitraryUserGestures);
> 
>     _websitePolicies->setAllowedAutoplayQuirks(quirks);
> }
>Index: Source/WebKit/UIProcess/Cocoa/WebViewImpl.mm
>===================================================================
>--- Source/WebKit/UIProcess/Cocoa/WebViewImpl.mm	(revision 235539)
>+++ Source/WebKit/UIProcess/Cocoa/WebViewImpl.mm	(working copy)
>@@ -2118,7 +2118,7 @@ void WebViewImpl::viewDidMoveToWindow()
>         if (m_shouldDeferViewInWindowChanges)
>             m_viewInWindowChangeWasDeferred = true;
>         else
>-            activityStateChanges |= WebCore::ActivityState::IsInWindow;
>+            activityStateChanges.add(WebCore::ActivityState::IsInWindow);
>         m_page->activityStateDidChange(activityStateChanges);
> 
>         updateWindowAndViewFrames();
>@@ -2144,7 +2144,7 @@ void WebViewImpl::viewDidMoveToWindow()
>         if (m_shouldDeferViewInWindowChanges)
>             m_viewInWindowChangeWasDeferred = true;
>         else
>-            activityStateChanges |= WebCore::ActivityState::IsInWindow;
>+            activityStateChanges.add(WebCore::ActivityState::IsInWindow);
>         m_page->activityStateDidChange(activityStateChanges);
> 
>         [NSEvent removeMonitor:m_flagsChangedEventMonitor];
>Index: Source/WebKit/UIProcess/WebsiteData/WebsiteDataRecord.cpp
>===================================================================
>--- Source/WebKit/UIProcess/WebsiteData/WebsiteDataRecord.cpp	(revision 235539)
>+++ Source/WebKit/UIProcess/WebsiteData/WebsiteDataRecord.cpp	(working copy)
>@@ -79,30 +79,27 @@ String WebsiteDataRecord::displayNameFor
> 
> void WebsiteDataRecord::add(WebsiteDataType type, const WebCore::SecurityOriginData& origin)
> {
>-    types |= type;
>-
>+    types.add(type);
>     origins.add(origin);
> }
> 
> void WebsiteDataRecord::addCookieHostName(const String& hostName)
> {
>-    types |= WebsiteDataType::Cookies;
>-
>+    types.add(WebsiteDataType::Cookies);
>     cookieHostNames.add(hostName);
> }
> 
> #if ENABLE(NETSCAPE_PLUGIN_API)
> void WebsiteDataRecord::addPluginDataHostName(const String& hostName)
> {
>-    types |= WebsiteDataType::PlugInData;
>-
>+    types.add(WebsiteDataType::PlugInData);
>     pluginDataHostNames.add(hostName);
> }
> #endif
> 
> void WebsiteDataRecord::addHSTSCacheHostname(const String& hostName)
> {
>-    types |= WebsiteDataType::HSTSCache;
>+    types.add(WebsiteDataType::HSTSCache);
>     HSTSCacheHostNames.add(hostName);
> }
> 
>@@ -157,8 +154,7 @@ String WebsiteDataRecord::topPrivatelyCo
> 
> void WebsiteDataRecord::addOriginWithCredential(const String& origin)
> {
>-    types |= WebsiteDataType::Credentials;
>-
>+    types.add(WebsiteDataType::Credentials);
>     originsWithCredentials.add(origin);
> }
> 
>Index: Source/WebKit/UIProcess/mac/WKInspectorViewController.mm
>===================================================================
>--- Source/WebKit/UIProcess/mac/WKInspectorViewController.mm	(revision 235539)
>+++ Source/WebKit/UIProcess/mac/WKInspectorViewController.mm	(working copy)
>@@ -238,7 +238,7 @@ - (void)inspectorWKWebViewReload:(WKInsp
> 
>     OptionSet<WebCore::ReloadOption> reloadOptions;
>     if (WebKit::linkedOnOrAfter(WebKit::SDKVersion::FirstWithExpiredOnlyReloadBehavior))
>-        reloadOptions |= WebCore::ReloadOption::ExpiredOnly;
>+        reloadOptions.add(WebCore::ReloadOption::ExpiredOnly);
> 
>     _inspectedPage->reload(reloadOptions);
> }
>Index: Source/WebKit/WebProcess/InjectedBundle/DOM/InjectedBundleNodeHandle.cpp
>===================================================================
>--- Source/WebKit/WebProcess/InjectedBundle/DOM/InjectedBundleNodeHandle.cpp	(revision 235539)
>+++ Source/WebKit/WebProcess/InjectedBundle/DOM/InjectedBundleNodeHandle.cpp	(working copy)
>@@ -170,9 +170,9 @@ static RefPtr<WebImage> imageForRect(Fra
> 
>     auto paintBehavior = frameView->paintBehavior() | PaintBehavior::FlattenCompositingLayers | PaintBehavior::Snapshotting;
>     if (options & SnapshotOptionsForceBlackText)
>-        paintBehavior |= PaintBehavior::ForceBlackText;
>+        paintBehavior.add(PaintBehavior::ForceBlackText);
>     if (options & SnapshotOptionsForceWhiteText)
>-        paintBehavior |= PaintBehavior::ForceWhiteText;
>+        paintBehavior.add(PaintBehavior::ForceWhiteText);
> 
>     auto oldPaintBehavior = frameView->paintBehavior();
>     frameView->setPaintBehavior(paintBehavior);
>Index: Source/WebKit/WebProcess/InjectedBundle/DOM/InjectedBundleRangeHandle.cpp
>===================================================================
>--- Source/WebKit/WebProcess/InjectedBundle/DOM/InjectedBundleRangeHandle.cpp	(revision 235539)
>+++ Source/WebKit/WebProcess/InjectedBundle/DOM/InjectedBundleRangeHandle.cpp	(working copy)
>@@ -150,11 +150,12 @@ RefPtr<WebImage> InjectedBundleRangeHand
>     graphicsContext->translate(-paintRect.location());
> 
>     OptionSet<PaintBehavior> oldPaintBehavior = frameView->paintBehavior();
>-    OptionSet<PaintBehavior> paintBehavior = oldPaintBehavior | PaintBehavior::SelectionOnly | PaintBehavior::FlattenCompositingLayers | PaintBehavior::Snapshotting;
>+    OptionSet<PaintBehavior> paintBehavior = oldPaintBehavior;
>+    paintBehavior.add({ PaintBehavior::SelectionOnly, PaintBehavior::FlattenCompositingLayers, PaintBehavior::Snapshotting });
>     if (options & SnapshotOptionsForceBlackText)
>-        paintBehavior |= PaintBehavior::ForceBlackText;
>+        paintBehavior.add(PaintBehavior::ForceBlackText);
>     if (options & SnapshotOptionsForceWhiteText)
>-        paintBehavior |= PaintBehavior::ForceWhiteText;
>+        paintBehavior.add(PaintBehavior::ForceWhiteText);
> 
>     frameView->setPaintBehavior(paintBehavior);
>     ownerDocument.updateLayout();
>Index: Source/WebKit/WebProcess/WebPage/FindController.cpp
>===================================================================
>--- Source/WebKit/WebProcess/WebPage/FindController.cpp	(revision 235539)
>+++ Source/WebKit/WebProcess/WebPage/FindController.cpp	(working copy)
>@@ -56,15 +56,15 @@ WebCore::FindOptions core(FindOptions op
> {
>     WebCore::FindOptions result;
>     if (options & FindOptionsCaseInsensitive)
>-        result |= WebCore::CaseInsensitive;
>+        result.add(WebCore::CaseInsensitive);
>     if (options & FindOptionsAtWordStarts)
>-        result |= WebCore::AtWordStarts;
>+        result.add(WebCore::AtWordStarts);
>     if (options & FindOptionsTreatMedialCapitalAsWordStart)
>-        result |= WebCore::TreatMedialCapitalAsWordStart;
>+        result.add(WebCore::TreatMedialCapitalAsWordStart);
>     if (options & FindOptionsBackwards)
>-        result |= WebCore::Backwards;
>+        result.add(WebCore::Backwards);
>     if (options & FindOptionsWrapAround)
>-        result |= WebCore::WrapAround;
>+        result.add(WebCore::WrapAround);
>     return result;
> }
> 
>@@ -204,7 +204,7 @@ void FindController::findString(const St
>     // we need to avoid sending the non-painted selection change to the UI process
>     // so that it does not clear the selection out from under us.
> #if PLATFORM(IOS)
>-    coreOptions |= DoNotRevealSelection;
>+    coreOptions.add(DoNotRevealSelection);
> #endif
> 
>     willFindString();
>Index: Source/WebKitLegacy/mac/ChangeLog
>===================================================================
>--- Source/WebKitLegacy/mac/ChangeLog	(revision 235539)
>+++ Source/WebKitLegacy/mac/ChangeLog	(working copy)
>@@ -1,3 +1,15 @@
>+2018-08-31  Antti Koivisto  <antti@apple.com>
>+
>+        Replace OptionSet |= and -= operators with add() and remove() functions
>+        https://bugs.webkit.org/show_bug.cgi?id=189169
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * WebView/WebFrame.mm:
>+        (-[WebFrame _drawRect:contentsOnly:]):
>+        * WebView/WebView.mm:
>+        (coreOptions):
>+
> 2018-08-31  Frederic Wang  <fwang@igalia.com>
> 
>         Bug 182053 - [CSSOM View] Implement standard behavior for scrollingElement
>Index: Source/WebKitLegacy/mac/WebView/WebFrame.mm
>===================================================================
>--- Source/WebKitLegacy/mac/WebView/WebFrame.mm	(revision 235539)
>+++ Source/WebKitLegacy/mac/WebView/WebFrame.mm	(working copy)
>@@ -649,16 +649,16 @@ - (void)_drawRect:(NSRect)rect contentsO
>         // For subframes, we need to inherit the paint behavior from our parent
>         if (FrameView* parentView = parentFrame ? parentFrame->view() : nullptr) {
>             if (parentView->paintBehavior().contains(PaintBehavior::FlattenCompositingLayers))
>-                paintBehavior |= PaintBehavior::FlattenCompositingLayers;
>+                paintBehavior.add(PaintBehavior::FlattenCompositingLayers);
>             
>             if (parentView->paintBehavior().contains(PaintBehavior::Snapshotting))
>-                paintBehavior |= PaintBehavior::Snapshotting;
>+                paintBehavior.add(PaintBehavior::Snapshotting);
>             
>             if (parentView->paintBehavior().contains(PaintBehavior::TileFirstPaint))
>-                paintBehavior |= PaintBehavior::TileFirstPaint;
>+                paintBehavior.add(PaintBehavior::TileFirstPaint);
>         }
>     } else
>-        paintBehavior |= [self _paintBehaviorForDestinationContext:ctx];
>+        paintBehavior.add([self _paintBehaviorForDestinationContext:ctx]);
>         
>     view->setPaintBehavior(paintBehavior);
> 
>Index: Source/WebKitLegacy/mac/WebView/WebView.mm
>===================================================================
>--- Source/WebKitLegacy/mac/WebView/WebView.mm	(revision 235539)
>+++ Source/WebKitLegacy/mac/WebView/WebView.mm	(working copy)
>@@ -571,17 +571,17 @@ FindOptions coreOptions(WebFindOptions o
> {
>     FindOptions findOptions;
>     if (options & WebFindOptionsCaseInsensitive)
>-        findOptions |= CaseInsensitive;
>+        findOptions.add(CaseInsensitive);
>     if (options & WebFindOptionsAtWordStarts)
>-        findOptions |= AtWordStarts;
>+        findOptions.add(AtWordStarts);
>     if (options & WebFindOptionsTreatMedialCapitalAsWordStart)
>-        findOptions |= TreatMedialCapitalAsWordStart;
>+        findOptions.add(TreatMedialCapitalAsWordStart);
>     if (options & WebFindOptionsBackwards)
>-        findOptions |= Backwards;
>+        findOptions.add(Backwards);
>     if (options & WebFindOptionsWrapAround)
>-        findOptions |= WrapAround;
>+        findOptions.add(WrapAround);
>     if (options & WebFindOptionsStartInSelection)
>-        findOptions |= StartInSelection;
>+        findOptions.add(StartInSelection);
>     return findOptions;
> }
> 
>Index: Tools/ChangeLog
>===================================================================
>--- Tools/ChangeLog	(revision 235539)
>+++ Tools/ChangeLog	(working copy)
>@@ -1,3 +1,13 @@
>+2018-08-31  Antti Koivisto  <antti@apple.com>
>+
>+        Replace OptionSet |= and -= operators with add() and remove() functions
>+        https://bugs.webkit.org/show_bug.cgi?id=189169
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * TestWebKitAPI/Tests/WTF/OptionSet.cpp:
>+        (TestWebKitAPI::TEST):
>+
> 2018-08-31  Frederic Wang  <fwang@igalia.com>
> 
>         Bug 182053 - [CSSOM View] Implement standard behavior for scrollingElement
>Index: Tools/TestWebKitAPI/Tests/WTF/OptionSet.cpp
>===================================================================
>--- Tools/TestWebKitAPI/Tests/WTF/OptionSet.cpp	(revision 235539)
>+++ Tools/TestWebKitAPI/Tests/WTF/OptionSet.cpp	(working copy)
>@@ -96,16 +96,29 @@ TEST(WTF_OptionSet, Minus)
>     EXPECT_TRUE((set - set).isEmpty());
> }
> 
>-TEST(WTF_OptionSet, MinusEqual)
>+TEST(WTF_OptionSet, AddAndRemove)
> {
>-    OptionSet<ExampleFlags> set { ExampleFlags::A, ExampleFlags::B, ExampleFlags::C };
>+    OptionSet<ExampleFlags> set;
> 
>-    EXPECT_TRUE(((set -= ExampleFlags::A) == OptionSet<ExampleFlags> { ExampleFlags::B, ExampleFlags::C }));
>-    EXPECT_TRUE((set == OptionSet<ExampleFlags> { ExampleFlags::B, ExampleFlags::C }));
>-    EXPECT_TRUE(((set -= ExampleFlags::D) == OptionSet<ExampleFlags> { ExampleFlags::B, ExampleFlags::C }));
>-    EXPECT_TRUE((set == OptionSet<ExampleFlags> { ExampleFlags::B, ExampleFlags::C }));
>-    EXPECT_TRUE((set -= set).isEmpty());
>-    EXPECT_TRUE(set.isEmpty());
>+    set.add(ExampleFlags::A);
>+    EXPECT_TRUE(set.contains(ExampleFlags::A));
>+    EXPECT_FALSE(set.contains(ExampleFlags::B));
>+    EXPECT_FALSE(set.contains(ExampleFlags::C));
>+
>+    set.add({ ExampleFlags::B, ExampleFlags::C });
>+    EXPECT_TRUE(set.contains(ExampleFlags::A));
>+    EXPECT_TRUE(set.contains(ExampleFlags::B));
>+    EXPECT_TRUE(set.contains(ExampleFlags::C));
>+
>+    set.remove(ExampleFlags::B);
>+    EXPECT_TRUE(set.contains(ExampleFlags::A));
>+    EXPECT_FALSE(set.contains(ExampleFlags::B));
>+    EXPECT_TRUE(set.contains(ExampleFlags::C));
>+
>+    set.remove({ ExampleFlags::A, ExampleFlags::C });
>+    EXPECT_FALSE(set.contains(ExampleFlags::A));
>+    EXPECT_FALSE(set.contains(ExampleFlags::B));
>+    EXPECT_FALSE(set.contains(ExampleFlags::C));
> }
> 
> TEST(WTF_OptionSet, ContainsTwoFlags)
>@@ -141,15 +154,6 @@ TEST(WTF_OptionSet, ContainsTwoFlags3)
>     EXPECT_FALSE(set.contains(ExampleFlags::C));
> }
> 
>-TEST(WTF_OptionSet, OperatorBitwiseOr)
>-{
>-    OptionSet<ExampleFlags> set = ExampleFlags::A;
>-    set |= ExampleFlags::C;
>-    EXPECT_TRUE(set.contains(ExampleFlags::A));
>-    EXPECT_FALSE(set.contains(ExampleFlags::B));
>-    EXPECT_TRUE(set.contains(ExampleFlags::C));
>-}
>-
> TEST(WTF_OptionSet, EmptyOptionSetToRawValueToOptionSet)
> {
>     OptionSet<ExampleFlags> set;
>@@ -302,10 +306,10 @@ TEST(WTF_OptionSet, NextItemAfterLargest
> TEST(WTF_OptionSet, IterationOrderTheSameRegardlessOfInsertionOrder)
> {
>     OptionSet<ExampleFlags> set1 = ExampleFlags::C;
>-    set1 |= ExampleFlags::A;
>+    set1.add(ExampleFlags::A);
> 
>     OptionSet<ExampleFlags> set2 = ExampleFlags::A;
>-    set2 |= ExampleFlags::C;
>+    set2.add(ExampleFlags::C);
> 
>     OptionSet<ExampleFlags>::iterator it1 = set1.begin();
>     OptionSet<ExampleFlags>::iterator it2 = set2.begin();

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Attachments on bug 189169: 348548 | 348618 | 348620 | 348622 | 348626 | 348628 | 348630 | 348633